Malicious PDF — malware analysis report

Static analysis result for SHA-256 409d3c61a77be896…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 14:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 762fec24f5af5c8f432ec51e19751416 SHA-1: 7305dd816b76cc936dd30eeb56b142aa69e642df SHA-256: 409d3c61a77be896f38762f130d7a64766f1db7664761dbb7ad1dc1355ae2f66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=the+new+historicism+reader+pdf PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/288325b143bb51019c6ad72b03c8ec42/8659762699.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/gigagatixi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/91915228671.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/42453471509.pdfIn PDF document text
    • https://advik.net/userfiles/file/70534440990.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/32936329348.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de9c620b2e1---rapupobijo.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/65636902214.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7c4dalbs3p56ugg8coi5nfc1kr/kerewirewa.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/92036038588.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/29321278120.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d07be5963---xejelojodunat.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e2d7313f914d6d70fa1ac2c57921e86b/devikifotenusovomitusita.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/794905a31103b49f998e09498ad5f9d4/17993412472.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eae60121c---rupuwofu.pdfIn PDF document text
    • https://tantecoccole016.it/file/70769664651.pdfIn PDF document text
    • http://chieucoingason.vn/files/97707634650.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d091e7943---nuzefuzewuberawopabo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c631c282a---19800105697.pdfIn PDF document text
    • http://4bx.pl/public/file/zukewowajudabut.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/8065809999.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb65f99eff---kituwifipoz.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/sotodijebazut.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/93e60701885000f9d92cfa1992d2391c/gozuxijawolomixitebib.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 18272 bytes
SHA-256: 8229630dca877ac3e848adfb8cf5c9a938868c0fcfa527594334631e4435d1d6
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 10888 bytes
SHA-256: 3cbef51fe9c13654502d30634a0768465a184e338c33440c91972a9319db2a13
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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