Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fbcb3fa96ffe0e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b16ad10dd9f53ebd879e0c581162eed SHA-1: 04348a363b98239218409f64b5d13815a0e56292 SHA-256: 28fbcb3fa96ffe0e061f1124ae7e47228c0982e3b6a9ed2028a36ab3658464b2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using a link farm to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6826

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://pixomot.ru/uplcv?utm_term=fb+liker+auto+apk PDF link annotation
    • http://knshzj.com/CKEdit/upload/files/16767972266.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mutizomelufofogam.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/buvugefugegonavuvow.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/aa18247b3e92cb08fe27983a8729531e/fivorowepufafapemolukar.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/49884688464.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f512f69028---81690997217.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2962e5cc4ec3ad34641aeafd8024bbe0/22758772696.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/raporobidawuwekutujo.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109011447506275.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5639f47b---votezatupegazaviti.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/93e4217368b6faee2af89c7b0b380771/diwozoxupetisasate.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/91466028229.pdfIn PDF document text
    • http://metallpress.ru/files/misokuwagadasetujifuw.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/41159110470.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/720399927.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sojekepisavafez.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/gozazusuz.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908011129_1y5973.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614171816ad48---zorako.pdfIn PDF document text
    • http://space-edge.com/upload/files/13252907990.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/xovixoluloduvul.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/79b17062cb15268d1827908af64131ce/99315573865.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/17729212008.pdfIn 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_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 17824 bytes
SHA-256: 006eb0e039b2f5db303ea81b1e97edddcc350cbc73a07c43e3a51b3efa32254d
font_01_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10284 bytes
SHA-256: ca6b6d55f77b9d3f32f0a2dab08c556879ed941767fe4ecfde36bb24c7ba4682
font_02_sfnt_off0001182c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1