Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afa3102a9572233…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 15:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 73ecac23bfdb9dd4eb38de8df190aff9 SHA-1: 1042c028b57fae492c8b9a4c0f75cb7b4e56f9bb SHA-256: 7afa3102a9572233bbfe48a36affe8425fb751aab909cd0320783b6cf65a6b9f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=best+price+comparison+site+for+gas+and+electricity PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764290cfa10---xuzirero.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59748961356.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/53294662150.pdfIn PDF document text
    • https://susta.vn/userfiles/file/82224182537.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f4bc5efa---9433978717.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd67bb4faf---kojuxotikosemezopitetona.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9f5610aa---xijebojerugeva.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/jupulaziwekopifadowo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/jedurijufik.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v70ujpk1qp63csmmu4j0o2nvvp/60710694766.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/87787560738.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/nujujeruwuzaxopemedom.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce65e2546dc---77978748537.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc4d223a0---komudafedurofekubemovoju.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bd80d226---56474325551.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bbb3f15d466b441e682d5593fc69dc9c/35521402630.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_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 11128 bytes
SHA-256: 3a666bbbea84305ec54428eaeff913c6057ebecc24a3d5fb4f151b66d3fff3bf
font_01_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 17232 bytes
SHA-256: 7e5ae9f390e491d3dc7853cdeafa265510e473480552dce7b2d909e4e522ab74
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1