Malicious PDF — malware analysis report

Static analysis result for SHA-256 5727fb97554bab0c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 15:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 491231b964c10c608c8f03a9537b1213 SHA-1: 3d8d4e9f4a0b0bfe0803d9d58233bc20a54d46ed SHA-256: 5727fb97554bab0c0432786b5d5222acb213ee23aed4d617f39a6a2c9544efd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hiroi-es.info/yamituki-n/uploads/files/duxababofot.pdf In PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/bomazenutudawa.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/wopovadotofatigadaneb.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/15683734456.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fe18a3eb5cea3db95cb256062735ce81/nininabefomurebi.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/20262451931.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/84838567962.pdfIn PDF document text
    • https://khanikango.in/file/romimuvo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f373a553d76cac71a36b2d88c212dd4c/69914152464.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/6098481011.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/28030fdd8814b4811e4319c3652a1921/87121114664.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7302dd11b---22916554238.pdfIn PDF document text
    • http://packamate.com/userfiles/60657681288.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/1922692752.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa6c1a2c---70102800908.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ec77216c---fidogibirewamuwazusapu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/60728d6e772aec40ee72815e1fa908c2/80968128351.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d4678c4d8f9846e1cdacb0c550e1ba0/33336411860.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fogal.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/99159025547.pdfIn PDF document text
    • https://sinarwaja.com/account/files/delekevivixefiruzesofu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/48472449403.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcmu5ts952nn3jo4nsr2omjjs7/wewasupep.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95878086236.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sqkqb2f4m6ve4ei9bdg01i1qnd/kavupapafir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=curso+de+manejo+de+redes+sociales+pdfPDF 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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 19180 bytes
SHA-256: a1de702df6d29269c1f7d5d8bcc2329b1365b39160932249206a4f3cb8a570da
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 10944 bytes
SHA-256: d521309cfac9efb45918c7d5f18893ce2ac702d0e5c2e7a1b6e46528f718d3e4
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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