Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6374c5f3e2f697…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 09:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9575b6b0d19755dea1b683d110950030 SHA-1: 9e6214317f5eefaeeb58633ddf3cca28c9dbe7b7 SHA-256: ad6374c5f3e2f69783b54f1be4445fb8d5b3423ce5dc27a5f84b19a321d8b9f5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself contains multiple embedded URLs, reinforcing the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=transformations+of+functions+practice+worksheet PDF link annotation
    • https://aldapa.eus/files/galeria/files/19211568314.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/wejenebumofenovodemib.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/3145901792.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5d635ed4---21930570066.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/32872500867.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082246e6b276---mewixu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c797cf0bbc---geranukimarazeze.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070722cbb4c1---wevuvofesiwoku.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a790f8ea343---nutixitusinegodis.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6262a7771---sefolowo.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vunerebako.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7375884a6253459a3119bfd578eecbf0/nefop.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb504360d28---46922732384.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/276420be63ab1b108c7862317293af6a/89458769183.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/tunudodevikowajo.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/7577194332.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/vipoxamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2739e8908---68989745008.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/18812585219.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3dabbe17a59cfefd1aa7c23dcd3e0bea/fosojigu.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/33189077239.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeac27a5d---45580089558.pdfIn PDF document text
    • http://skomi.ru/img/files/file/vinovepewo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/u85mik2nv29r9qe2kc4v25o7b9/60797352579.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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 15580 bytes
SHA-256: b15a3184a7164d38e6b9cbd476d96b6b5bdcafff4eabbe6c9f873d2564b50dec
font_01_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EF 10940 bytes
SHA-256: 8af28819d0f699c0733139772a648c2640228e929a6338854678f258e33a3b27

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