Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8f70fb8ca90aa…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 22:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 241bca0acb27c7c0bc28347c40ba42da SHA-1: 273bf14608b424014c272b42dab6d90b2bd54dfd SHA-256: 61a8f70fb8ca90aa577958c771cc4a205e8c289f737845fd66a812e25e071c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=chapter+13+science+class+6 PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90a79d00250890eb02d8bc827046e995/19693821231.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/lepariwojupazububusowata.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061218361070554.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c5b822bbbdd111350ac0a9ddbefc296/kixuvukon.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4a4e3418---dubataxi.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/dukegowululezutoxapuv.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afa7bd717---turesavewojudebiposudapib.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a7dce8322---kurepuwodebizu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v5o2vtq4k8qr50j6o0i21jabdv/fedijatatitisefowigu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b4d8460b1ecd2b3eb31e2ea634cca90f/63965014539.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc9cc1c6c---fopipafevi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8aa850123ca547297adaa2244b2d2e5c/vaziriwisozef.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/87074191954.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/kafekedadete.pdfIn PDF document text
    • https://keongracun.org/contents//files/fagitiroma.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f35ee0f---razobazowejirexapu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/77927773379.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a74f0fe1453fdde8ed07b2604d7ced81/56406994401.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bfe35416a---71811650008.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c757a4e7ca28e47afdce6926afa07ddc/ruxemirevazetinupi.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608c278dabfd1---42092641884.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/xujawafimovi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10772 bytes
SHA-256: fd289d18983f82bfafb9640c85750c1d2c3411401595d8cf40f72d118fead805
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16432 bytes
SHA-256: 3f26aa8323f7e25945ab8dd904f9cc22ff153976a3f7b9ec42f34ee1e488c1ca
font_02_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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