Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d4bff385c8d728…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 03:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d59f5e3ae986fac71d5a4a9e618aa0eb SHA-1: a8f3cd8b698b28f637af880d45066459ecaf48bc SHA-256: 08d4bff385c8d72829b491422a82637525d86da59d8446be414b62f6f024c917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://euroroma-bg.org/files/file/38220288492.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa787cdca4---zenoludomidokomudaxefimu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/repijotofipunevizuxesuki.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7ajmpqdh7me73fojj9t6nkpp7o/7432188821.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c0deaa91fb3cb2c0fc4b35e7cf33317d/tanenadivuluduzelaw.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/rafadibumivid.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/gumuwoditaxu.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/2846311724.pdfIn PDF document text
    • https://razredna-nastava.net/files/rifuwuzagopajobap.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/94985778642.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/90434592470.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/xenokodugalinumi.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/1522583469.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/97141185129.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vakoni.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zojofidinitoloreditos.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/86231297307.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/terof.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wevadezodavegodixililop.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/dovibipomiwej.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ed7e52a847b162c55653f0a459625b51/63484578979.pdfIn PDF document text
    • https://gornjastubica.hr/files/kunagesikuvigovolas.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/46552952074.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/51043024744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=survival+city+zombie+base+build+and+defend+modPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 11192 bytes
SHA-256: 88e51b8bc54cb2cbf4e00a179d5d9697a75cdecbc97584bbc7d1429a1fbba01c
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 17544 bytes
SHA-256: 3512ae6e9d5fadfcf8ba1552b857d6c1bcd0eecd4ce790f7f101f67ab4493bc4
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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