Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf90bea6163f2a6d…

MALICIOUS

PDF

97.0 KB Created: 2021-09-02 07:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d873b3a3267e2c3a7c74289fe8855a93 SHA-1: feb866978a0d88309e5fa57585961cdb05c3f6c9 SHA-256: cf90bea6163f2a6dab860b8cbab67a5e8ce6b3719e12e3acee452f02fdbd409a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bfde190b3---jegamax.pdf In PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sivugemovebaga.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0109139cf---68082584728.pdfIn PDF document text
    • https://medtek.vn/storage/file/kajalo.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/luvirebikamigugirup.pdfIn PDF document text
    • https://aashianarealty.com/file/lizobizijini.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41903ae63---wonukevazinevopon.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/lekiditinenefawin.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607759645f7de---26054782816.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fc3eb178227add4b2825e06c54b50cda/vizisosoxukaneje.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e498e47edf---sapivaxovelin.pdfIn PDF document text
    • https://ancoraeducacion.com/images/62812839081.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/juzexu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/afc9b174fd5e4474212ac96a473785ad/74001926106.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/25201346399.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bomasuzexamowazagebixomem.pdfIn PDF document text
    • http://xsteelstock.com/d/files/powiza.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/kpps83tgvhmlb82qoigcl5t5lm/lozenarazes.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/76489849659.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tnk0kn4qnoabgirrikaftrlkgf/boratikinajefanuw.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8b67f6e9b20c731ff75b2083080ae3f5/87323079150.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/gelanabib.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/77342891138.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f5510psoe124ll9hejj60hqut2/bozavaroravesaperafukog.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/2963439064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=us+attorney+general+pleads+the+fifthPDF 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_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 10900 bytes
SHA-256: 059a0b691b8a99ea8f44a78737129a0c18f13bb1eb930b4b67e552b2cff33678
font_01_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 17984 bytes
SHA-256: 7b6e988767b2974df7087c8a1b6d60b0a53bc7b5b661626724d4c12ee36d9edb
font_02_sfnt_off000167c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1