Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fad03a713e10ff…

MALICIOUS

PDF

89.9 KB Created: 2021-07-06 04:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea4aa009e1d1a0129d63684d04e94d85 SHA-1: 836417c5122c23a22644ee72feccb2b2f4b3fb69 SHA-256: b7fad03a713e10fffadd1726636017551c156164a4706da936f7a52f3fe2685f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/s75e5f43i6c34q0i8vgjgeetbh/67449588239.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/669207317.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hueo1c7phs777ecs4qhl9famj1/18891978824.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b125370d---goroxonunatinawul.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8mmqli21drscmrfp057rdvegil/13318106804.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f9f00d280c56b016dd5189bade2e1175/60884519486.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fefokozonalisitezikatofud.pdfIn PDF document text
    • http://policylic.com/uploads/files/98327393495.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/migajejozoguka.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c015b5c49343f19dcbec9792429af547/22077866525.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913eef8d54b---32088596033.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/lizavebenabafikor.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c070be0c09a---37547554524.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/13247426205.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/752h7id66n56mcotgi5sk52ci9/17551065325.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/57080721895.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dff8de0bfa---19439050011.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lari5lg9p9ivbh6g1thu68s162/dirivisumojexidigonijuz.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/mogilaze.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/37700322738.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1s05ffts8f4q2iif1052p47ob4/92613993026.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa0595330---60702667383.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0be72766a---delebutogibulupuz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cd9b915c---49703396618.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1i5g231b44vttfl807geml7o4j/guzudeguvuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rockwood+freedom+2716f+for+salePDF 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_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10956 bytes
SHA-256: 0c8b7b577094fd73029b09c900597648db5904973bbe9ddc035d0c684c6212df
font_01_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16872 bytes
SHA-256: f0f83dbbeef05f8b32fd22fdac2fb57938bd93c8847c8f7357213998785aa490
font_02_sfnt_off00014226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1