Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10af5039fe4b089…

MALICIOUS

PDF

83.4 KB Created: 2021-07-23 01:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02149fe336ed74012454189fe5b54bc8 SHA-1: 94c3d3761358668184b12f696623af6dc10797d0 SHA-256: d10af5039fe4b089d8d17bfce136ed6f3ca069e8ba15758dab3b6e2202d490fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be directing users to other malicious or SEO-abused content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d1ad3fe111a6d306e19b517d4ee348f0/pokubixamulutaputin.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607963a2c2431---jejalimopo.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/movufufomiki.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/611080d0c36026eb87dab5d282fa6383/62705436331.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801918ebe6b---30797219826.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7789761c50---nexewogu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xepetedapifakotivolejok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mlkfkncjmicqmp45k5im8c5ut0/86867114122.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/61939151596.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/sipulibob.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/fidiwelis.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf05e154ff---86625980306.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/kumepugasejural.pdfIn PDF document text
    • http://artepcb.com/upload/files/befepobirujexeno.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bc1c9eb980c8898c4e0e18f298431200/modokasofer.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/vuwobubobe.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3b0094fb959ac876b8dd29d6f3d7f9cb/sawegan.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/24a2595a7639aa73fd54b9e4b23fc023/xonoxidulaloferadip.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zilifesepovo.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xunimenafufolepofew.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/kopixiwa.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g9lkr31mtfbuj2muu220lbuihk/farotivu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607623795c00d---2271399219.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/19588014936.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077007a66d8d---vojijatebidopikadojiku.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/sowifozofufilobuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=internal+combustion+engine+parts+and+functions+pptPDF 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 11156 bytes
SHA-256: 2cd92941c7e4a2232af0511027ed14c7604507038db1d342629c087012f272a0
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16284 bytes
SHA-256: fb4ac49271f077c59fb1b43842d270ccf75bf931ab7527ef8a6b08a0c0d824cd
font_02_sfnt_off000126fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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