Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71cfd58481da90f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 13:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 784aa071f88a182cbe0acf9a6e13bed4 SHA-1: b9be5423bc8acdf5d895e2bbad8fedd809728106 SHA-256: c71cfd58481da90f29fb9bcb6a60be84ef7647f67eb1b889df8c5e0d945d06b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads. These links likely serve as lures for phishing attacks or to distribute further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=pdf+file+l%C3%A0+g%C3%AC PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd6ad6377---25744578473.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/kipasudominefimudifuj.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d20a19b4b47---vadetazorodopadunobeb.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1ad8da97---tapusigokumu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e407259cc---28350400505.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/89108370212.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/lereb.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/genuv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079a5cf98c---70953132996.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/37716246412.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/14132490207.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/biwituxofonesadiko.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/bemevoxobev.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/juwaroxeluzutex.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062715720_987994414.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddebe6f4a---medagewudod.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/76184251372.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/h45tismodtrs8o3egb6udp8679/92647311244.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d5cfabbace34ceb4e678b29976744856/31637078864.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f05d11eb7b490c0b28ecb65a30cc8dc4/50844760307.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rqhi4asou6etk5tklrk87u6oms/44431131303.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/10769063310.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/32901142729.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/bavedepoxuxere.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/diporanuwobozonesarokib.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_off0000b9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BB 10024 bytes
SHA-256: aa00d35577da4b1d16aa5154c5e31835061017fbfe49a98c695bec300999be6e
font_01_sfnt_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 16416 bytes
SHA-256: ec7b5172e53fad35ec5e8d8b1446ff7c2568ee7517f2249e2c7b7f4b55e6022c
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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