Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd638c9ac2f45fe4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 14:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e0fece77c86c35893e3b7cf36b8ec2b9 SHA-1: b8d9af3e6f205eb79e60916023ad000db027c58d SHA-256: dd638c9ac2f45fe48bc6743e572a6a427da0be2b2230738e0baa7c301ebee41d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary goal appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 https://capital-publishing.com/ckfinder/userfiles/files/31446692122.pdf In PDF document text
    • https://censcakmu.org/board/file/files/lazomeviz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5cc61dfe---nezewigurebodisabojenada.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/72332865135.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gusiwuxasov.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/87827177376.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/rovobojiruwunedowolenolav.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/15264370042.pdfIn PDF document text
    • http://fgosvo.ru/files/files/merazazezi.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210914135608_484705924.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xexisa.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cf59e06aa739c7451ef614fe73ec49f9/refimuzojojelakizuv.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pugamunetufojaxidalazak.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/17145926252.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14961828168.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kofemipiguva.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88921415699.pdfIn PDF document text
    • https://angkalaris.com/contents/files/dexoxerewu.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nenaxejinupoxubava.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/jixuxisugi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/46098235545.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613997c521959---potukirilusipuvesib.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210916144950.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/lulibulogazu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tuwap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clash+royale+generator+no+human+verificationPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 11096 bytes
SHA-256: 864f756b71520f14e5ae26b09601fbf88a76ef01d92e2f6c243ce0f985ca478e
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 18652 bytes
SHA-256: 4b0d1a3a0b0da8911cf81c445f9a7fcd831d5fd86b59144f7a35de837e9bbf29

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