Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66cd903520ef205…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9a838255354d67dddee36889440c264 SHA-1: 55c623c4bca27796a919f7078d45d5a7515561ee SHA-256: a66cd903520ef205aa664ffba526581d5641027fd2b3aa11ef53fd78af7dee47
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, and detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to trick users into downloading further malicious content. The primary attack vector appears to be a malicious link embedded within the document, designed to lead users to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=miss+sloane+watch+online PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb5a6d1c2670950b87c80b897b392514/64553191465.pdfIn PDF document text
    • http://protezas.lt/i/File/zusonogopawoxal.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nipanakekogup.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/xisuti.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/fogasigamuzogexijojamuj.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/29824089171.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zezevezeziriwosikenema.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/85804945625.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/78797487957.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/36992546548.pdfIn PDF document text
    • http://fitviewer.info/files/file/83773157435.pdfIn PDF document text
    • https://davnosti.ru/upload/xadivosutavelaxezod.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/lixopuluzepemifiv.pdfIn PDF document text
    • http://btfa.tw/upload/files/bezidi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/64817776877.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/67795331201.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/wejobebiwexekugijo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/30992016471.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/sinogatisemidokasi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16134538375f04---zodizogukesaxen.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/7309051381.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/70017078406.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/64403821893.pdfIn PDF document text
    • http://aweibel.com/Photo/file/feweremogome.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/rojibupigabe.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dd4947168bef48dd8e9f90c3927fde2d/joganozusapag.pdfIn PDF document text
    • 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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 18168 bytes
SHA-256: 36ec2f1152b17ba07ccba66513d759c24540945462a04d101c57ae0741afd85f
font_01_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 10308 bytes
SHA-256: 3887729b199a14537355ab8abbfa6cfdf9fbeb6188d33012f64f556f5da1ed90
font_02_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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