Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b1001f30ca099c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 11:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a36dec6b94e2b9d02f3c00182b79080e SHA-1: 3c04ae65b37d88da150fc3cbc4a95da601847215 SHA-256: 78b1001f30ca099ce62933aed348fbfe48e6a71db2d4831149fea9227bc56489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=2019+ford+transit+owner%27s+manual PDF link annotation
    • https://thefertilizergranulators.com/d/files/xokidosokudukeguvax.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/44030487382.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dfffbfce53b962348e0a24922e929fb7/mijamikalawire.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cgoammtfdnq7u66267upu17h3e/bupovef.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e28be859---zamolixemi.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94395369328.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d049d2b24f5ac36caacda0641b891c98/23685247359.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/gudetazamezitiwuru.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5la7njjpj7i9re8hed5j17pas5/naxalig.pdfIn PDF document text
    • https://anakmeong.com/contents//files/98667899059.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/pisajepepa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/mavikagenoridotowijeg.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/635b0fb3f935913f41ed4f3d3fd9af2d/jifavobapigap.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fc41b102941---65061151951.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/43643289208.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8htlk8tccrnpgkru1njjn4i11d/vatavebuw.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160783035b66c8---nugoluzawobategez.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/64428165341.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088633149e5d---wesoreb.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/21679373006.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/24cb6b06ea89312c0563c2759da4361f/49578901040.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/26066039796.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091adfd267d3---54338114985.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5370e4ae5cfb57d9c8175e8814c6fda9/widugumiluvujekosoxo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/sofitigojekenuvenu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/cfa47e2iiin82cov1vn6o4glqn/baturudafi.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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 11100 bytes
SHA-256: 2e4ac255caa7957b6bd79aa9c1afb52c7ccea7e877c1a938c73c412547716959
font_01_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 17116 bytes
SHA-256: 851cd0924ddf0d7b2aea3cba75e7a94783084848a00dcfb10f290cacde5e7ff8
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1