Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f06dc78025a6ba…

MALICIOUS

PDF

86.3 KB Created: 2021-08-23 11:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd9a161f71f928e7c39e3cf916acc182 SHA-1: 69a5da0c8094617310ec5746838f397c993a1031 SHA-256: e8f06dc78025a6baf8dbb3bc763e0110c862f0a4659adcaaad204ef9bb47b4be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute further malicious content. The PDF structure itself is heavily obfuscated, and the document body is unreadable, indicating a focus on embedding external links rather than providing user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdf In PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/kizogejoved.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/kovatopiperuxekopa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jm0rvfoecl1sf6oal8d9ee8733/sesituvujafilasirevo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/jofekotabejuligerojexeva.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3fd8d66e86fe0748d160601c39ee7b0f/jezugodib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i6ikh486cirumit5141bvuvie6/lawagebufonipifeb.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/eq0qpk20b01cphptdgvutfmvv5/9104390577.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3l2c45h9pc7fa1udng50jm515r/pikarumesiwasifusev.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/52504003007.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/dukiperuxufumolotix.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca4d8fcfa---78261099625.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1041cce96f3e79046b22e22855aacf40/kunelufeguwowet.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c017a6de2---67788294787.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/daletabegolid.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/64423583573.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fe00ae3b---menitudurukaka.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9micqfpkqh5ek87s1c7r1nhn2r/rolarobavumufetegam.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd1aa4989---19134738031.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/72487899828.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210714_C7BD16DEB65A4DB5.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/51587018745.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc10fc3c4f4---venedipedoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+minecraft+housePDF 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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10872 bytes
SHA-256: 5e6b73e7735cc3d78779f3c046cddb57fea817b35e9f7ab823d45d6d831f6ad2
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 17140 bytes
SHA-256: d7ebde1faaec861a9c4a1cf00ff691a9308f121d1fe61986b9f2f12f5d8fc9fc
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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