Malicious PDF — malware analysis report

Static analysis result for SHA-256 b543681e2735b1d7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 14:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2e3c9c998cbcf2a25249499364f608f SHA-1: f3785889472f1e468f27045defefa2d59b3af3b5 SHA-256: b543681e2735b1d7dd56368f002959c3a9bf9201540364716a3d63634f38ed34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use URL parameters suggesting SEO manipulation for link farming. The primary attack pattern appears to be directing users to these compromised sites, likely as a prelude to phishing or further malware delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=church+planting+and+growth+strategies+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4dqdtg90ijsmeg201noiqdl0tk/2806280049.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2b875837e1fb416916c74cacf0b504c6/tupojufabazewomonur.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wixalanupawalejatimabuzar.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/38f378eeaed2574f567cc3b10a135dd8/zimetizidevunagu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6h0g48p38qdantuioeokhrkrv0/runoboxorana.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/kinagorij.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9e0872050---34670286758.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e2ec013---32023520385.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/51ub6vcu9mvr23pauj37jtrm71/setuwifanovufujisuti.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6rs1fq4homa0pqcr72a3l59101/78406200259.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/19222913083.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jarexopulev.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/75385197144.pdfIn PDF document text
    • http://cutskytools.com/d/files/26490808089.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/299669030.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/37669602164.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/sexekebibujademenixumidi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c6c8fe28c181f314ec57e821b9d363fb/52816484532.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9aivcebpm28takufeu05dhgpan/7413810268.pdfIn PDF document text
    • http://dytac.hk/userfiles/38373569388.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/nopujilusifexewosoriduse.pdfIn PDF document text
    • http://zamgph.com/uploads/file/301709306860.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/6092219828.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16776 bytes
SHA-256: 8aaa66f96033d920430964d9d57d5f126129fe11c698a97ac5cf80202b5ba712
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 11116 bytes
SHA-256: 49f1a0744caa911591a36550bda4726c3c94d15e55cf1eb4bc3acae93fd8664d
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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