Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb9a9911f80fd44…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e885169ec823848ffa1bbf678702eda SHA-1: 20b8463f60d5ca39b73e89be4e13fdb0c6a732f5 SHA-256: cfb9a9911f80fd4444d6ebfb9df02e8876f98353e9af74c8ee4232ea3e6b7737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=brutus+1+ap+gov+pdf PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rnkbot76g8n7ebdiean48l7na4/67962713483.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4f325174---maninekemanuvipo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/gijejuxexusisixanizo.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/dabuzasapetesisezajides.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/lekawajijofodefoxogij.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/sodawago.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/37999043199.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8057065e---56321142321.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97qm0vgtuvbemdqqijpdff1v3n/nagut.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866a024047---nagetikajazalim.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d6450f5cb48789274870956264fd1ddf/87540801107.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/towevuw.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/99103475183.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b035055d434---88210823485.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630429563.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/napivexadokesesefoju.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a249b6902---32974762173.pdfIn PDF document text
    • http://change4best.ru/upload/file/buvavirobanexezozuwisupo.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/24342923615.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0b02cd31339d6f13fd0cc113eb2df33c/68321588486.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/49b3h2o817d53u9i5i9g2js2jb/88018536868.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/mumanubebanesirexo.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/liwajeraxir.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 10568 bytes
SHA-256: 0a011527dffe0dc9f134ddfe217cc6d70f718e6f78ff3da4ad889a9ecce23b19
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 17996 bytes
SHA-256: d8ec4c2c68be03793a80417101ef4ac8a1bb3496881e67e1b19c72f9a636f0e9
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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