Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b0ed18eb1f29b6…

MALICIOUS

PDF

92.7 KB Created: 2021-07-05 05:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e20130c91a12ba3078b557ff16ef92c9 SHA-1: 35cb238eaf5b07ae972e63c5c58e8f812ecc6928 SHA-256: c4b0ed18eb1f29b67b5a9e2263cd799b1d640dd1516e4de80caf1a02ca1bc74c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=horizontal+velocity+in+projectile+motion
    • http://huile-de-nigelle.info/userfiles/file/kudopobadubudilekada.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/7tm3v1cnkk3cfon3kaij1ppcnk/doborexepones.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd199e880bd---30610919034.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210630_EAA5DB0BF5662929.pdf
    • http://greenbrier101.com/userimages/kuwufubisudevisurunuz.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/48aba796261aaaf7d55a46ad249a62af/tevojozapalizajetutowa.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb4bf7c23cec38692ab16256c3be6cf2/71944997455.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/gekexalom.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/gademuju.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0dbf556---nokulegetumirodaselewe.pdf
    • http://arniestribu.com/campannas/file/93577440262.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8ovj547dcmjnui6hmq5rhprfpg/58009744826.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/222e8dda97b3868665c4c938a717f8ff/10628546841.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27b08aa805---lejofo.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/xoxonomejenebu.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9nfsbg0ctt1eoon5bvglkds1c0/gotanipinexiluseviruzok.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9935cb5d---40139296653.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e35b7ed3---segugogepadid.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094836f5460f---48663159190.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bb891b3---28616887112.pdf
    • http://kingbikeonline.com/images/upload/File/biwidix.pdf
    • http://holocaustresearch.pl/nowy/photo/file/jasajorit.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/72d936109370abc63ab2a10be6a72e7b/3485871648.pdf
    • http://kursadowicz.pl/Upload/file/86966236924.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/javererufav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010757.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
font_01_sfnt_off00011f6e.bin
c2d87f96f9b7f41215face71ace7be4aeaabe0cb2933bc8cc416f2cd20f8f8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10728 bytes
font_02_sfnt_off00013806.bin
eea33e3d0c0c4937940424e1c150971efa08d9943e3ef2318f2e3dc7b5fbca81
pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 17100 bytes