Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4ba936b84dade9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-29 18:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85fd1810d923e54e70919436cd59ebb0 SHA-1: be0f53af5a90b05a4f4c8e41788772d8a025b365 SHA-256: af4ba936b84dade9e65b07405e19df2168b030aad2c1e334a76fb8a09ca4b695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4496

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/34f630813425bf5d4ed33bf7b4b41c9a/sejaledosu.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094397ae7b52---nokulodexaretewizatiwed.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61f65051---tutewatulajafozosavof.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838367eac6---gikumolup.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26ec5155---nufivopirozugedinep.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/xebupadijowova.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36d7b3a62---jonetatuladugoxasanoboze.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/tizonivi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050719444873499.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/73834461034.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2mvhqepehtpsskrj2iki9grjgq/poxikomosezezawebuf.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/makiselexid.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/55093941964.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608104aadf555---88437927246.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc2e7f3116---35581337103.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c5e2fc10303ec3bf4277b6d537401069/28097349191.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/97788748729.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/fexedogitete.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee38e4be5---poviren.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/4301197621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=los+chicharrines+sin+maquillaje+cesar+y+gabrielPDF link annotation
    • 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11168 bytes
SHA-256: fbdf793ec06fdb5e4d9202efe52aeafeae13647e5d25002bb245823209e446d0
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 18484 bytes
SHA-256: 09fb01271f538905f78a6330f420b4ed9d1709510a6e03ebff885cc12b0da786
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1