Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfee3e63b2d4605e…

MALICIOUS

PDF

113.9 KB Created: 2021-07-29 22:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cba60610071f812e4edf40c4edc71671 SHA-1: 490894b5cece0793b6c41abaa0fd4bb7e94020ad SHA-256: cfee3e63b2d4605ec3a873e62806cdc392aabc173f0e123160e0412dd0f1a958
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f37f1557e64---67735953364.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c45ea436---penoxawexefe.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/mibapovidijuwujo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbae23e0ce---94916723059.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5ab50f8341602bd0a56d2e7fd7f752ca/79061270311.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/625ccb85445df7230ce76183073e52ad/lugokofamarifejudida.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a0438721---22498269518.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e552e4c359---21898155245.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4b065f4e3679f223e5da359737284c9a/26494127638.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/faxarejotevuvusumixuf.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/ragebegete.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a72f6756f8c894a24743008438743175/duguzemadin.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ef23b79216c29ce86644810bba5ec8e8/xokabifozazud.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/bawagukekuwemofadasat.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc71d959e---sigudesunewetiraboji.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/37675248040.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vuxovez.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b14b2d2e9---29596652951.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16094619ad66f8---xiperevixaxunimurax.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/bugiritotemolomuroba.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sufalogavilotafusumi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ac00e6c4b73e97df11448409733cc4d3/paxotoretilariwafir.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872278bd843---8315550068.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/28668023027.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/zaturepuvu.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/33698251744.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeefe5a4bb---rudozelamolixogutat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=henry+stickmin+collection+free+download+mobilePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 11060 bytes
SHA-256: 5439ecd57674726a0947cd7bc51eca666ebcf6838bcb8a76e0ce0ebf7df7bebf
font_01_sfnt_off0001392e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00014e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16685 17728 bytes
SHA-256: 744e8f6f0191d5ea6e0974e6bddc0a8ccd89675e3fdb84e2ef39f1605826a102
font_04_sfnt_off000194f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F7 10576 bytes
SHA-256: d5a62283a2ffc0a0aca97643d026c273d6043f061b2f959cc30c65dc7b093f5e

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