Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b4a8858c3653e4…

MALICIOUS

PDF

112.7 KB Created: 2021-06-27 01:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 93cd8f836778c8cffb7a690dfdfe3231 SHA-1: 1c22595d0a2245ae256ed71b782a52242f1151ef SHA-256: 39b4a8858c3653e4f88264009177838763fbb4f156b3bae76b73d3b83be9ba37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://bamfieldrental.com/userfiles/file/24389283930.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d7d016708d85830d00b6a6cd52d4e992/kovakizobubuxivizis.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3g86sv8poc8f8chj1pfkep0cna/dilusonibawaponigafuwufa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a00efbbcfc1---tuxokititevojugawesewur.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/tizexedipitekodanalojudu.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/25645239580.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tazimoz.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/10930631352.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094821ddf137---tazunexokimajeruzaponeja.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/48ff2aac4f8b27060f9088de352a5755/dusoxasatavuwatedite.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c19152014b7---kagobigat.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/pozedinibogadu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a65faa2e2c9---tototarezopefeso.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qk0a0m4u6jrte8iolp3fstn4b8/45089379640.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/56667bb931341bc5b69abcafaff70413/84512242518.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98cfa0477a---53220022962.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8b9264d1---46734457980.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/reduferarudekewal.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/96e8647055a40936237a4d3a29f3e9f7/70750053745.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff90a79f1e---wepevasetaxupinotir.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/10044598131.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/80cd5844b900fb7dd09234693157b9af/vejatasol.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/79052367199.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/itup2o8e8tnfdi1so15q1dgd2p/divowola.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ee7e8e6d---sokedawetepasesefenumepal.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3044a5bcc---9127783374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=northeastern+tuition+costPDF 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_off00015458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6A 19172 bytes
SHA-256: d19554f1d13e0a3df2fca0edc0fabeb620ce70ec005b4f14bb24d8fd7cb8b2fe
font_02_sfnt_off00019ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDC 10360 bytes
SHA-256: 6ad92f9baae047513f3680d3361ec454d1afe3be40bdfec15d1561dd29c1cb43