Malicious PDF — malware analysis report

Static analysis result for SHA-256 494afdac7ea7d60d…

MALICIOUS

PDF

121.6 KB Created: 2021-06-26 12:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ae90c400bb7a8ceb5f314af158d1b0a SHA-1: 1ee60c78c4700ac4cb63d08c18249a5edddaf05e SHA-256: 494afdac7ea7d60deee943918d1a60d3f93f876d8f104a7538fbd47127eae6df
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=everything+wrong+with+america PDF link annotation
    • http://meteosputnik.ru/userfiles/file/kozedilesoxaxu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/46312047892.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba39ea7f2---zuwutaranod.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/jimumowudamefaxulowim.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fd2b2ac47---duzidifokabido.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/fi8has9b5o8f9nld6vd7022iqs/ludabumolowuriwosixevimo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2ab08d5118cd7d90ba0532e1aab0ab68/98932158778.pdfIn PDF document text
    • http://chromavials.com/d/files/zepazuropekopugeloduled.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b1adc0e6---18057818294.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3ed7fj3ojv6gaatnf91dg1990/mofivupidegojo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pci7lkt4664ov5d3jd8cpkj7es/26874763110.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wusabubodewuwubusuriva.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5bsourfumnu4v139lisqu73b65/fijuvegubilenisa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f81572bcf---95439154803.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7a6660e108605d3aff36c69ed61ce0d/49221370963.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/takaxok.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65166396173.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/87fd96005c5e74bd3fff9921a480ef71/57288305695.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tntmodmqoi6if5qj4f3rqh6cor/gixemomovasijiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099099b9758f---4717384740.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/76628551495.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/08142015816.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/weguxewi.pdfIn PDF document text
    • http://artospace.com/pics/file/bumelegurebazixudej.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/77643537010.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_off00017a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2E 17208 bytes
SHA-256: 94baea4b5e9acfbb2fafbaf854f7edbaf96a22fb30100949880467fe7f1cc388
font_01_sfnt_off0001a707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF1E 10712 bytes
SHA-256: 256c169d70408513ad1a09f6e3765375487330d5ae9fd3554cf46a685d75edd9

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