Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75b7c22145366f4…

MALICIOUS

PDF

79.7 KB Created: 2021-08-02 14:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19c84a158e7dca8daa0a3179e9680c4b SHA-1: 64cf2f4ca50dd4146a87414178ea506a018c20e7 SHA-256: c75b7c22145366f44ada30a5fd91925fbe24ae5cef0a5aa3fd5e2c30cd47b214
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the link farm structure is evident from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://kesifveotesi.com/files/51590664842.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/5093849136.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/nebolovevepokaso.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c724672c06d---bomanuvabiroxutixolakuwaf.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b1f8b839---45868555002.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/88594745061.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/77381775059.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/2787553472.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8clj3jhiej80ef8eitd190k293/buwirigizaxum.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/01baa2b89ae31fd0d95b9df3fc3e6819/10672018865.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d62359961c262babeefe47146873e2bb/5631592698.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ab0f3609---93731193738.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f98a3cc4---47907051714.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78f116997eb2f5a3c935161c471772e4/40682602725.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082951391a2d---bufatumijosekova.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce7c5ac52---saxukawoseduka.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/1553387961.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/fonudowe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d05570afa---bekovezamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=frigidaire+affinity+washer+and+dryer+owners+manualPDF link annotation
    • 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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 11080 bytes
SHA-256: e78500fcbd9c86e5eb1e3e0e7872ba8c3ae686728736a453f63577c088b6ae87
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16676 bytes
SHA-256: ef1f4ffa1c0325edb8a1712063dfcf732453ebd7021da60456e0ffec26ada011
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1