Malicious PDF — malware analysis report

Static analysis result for SHA-256 da752b5dd676bdfa…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 00:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24ff16a79b3246bf786693d3f9e0e261 SHA-1: b974ff9bce15e2a0561cbc6f46b6a8811cc399c5 SHA-256: da752b5dd676bdfac34d5c633af73abf3b70da07369fd85973481280d582cae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ayhancevik.com/images_upload/files/jorumisivafirorak.pdf In PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/pilobugexibugaz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g8qb32a7iukti5snnqfe29oha1/nugipatibefexexugibiledel.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/30345081168.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64959ee250---ladipigajurezabu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jb2h00jdfq10435vhg49vdem27/basalinuzaratukanow.pdfIn PDF document text
    • http://ge-mak.com/files/61237370145.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d0b21805---fakititisu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091decd9b4df---43809120830.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210815025136.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/77323242596.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/mamagaxemeximimezuwuw.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/57971600007.pdfIn PDF document text
    • http://marketingnews.fr/images/file/texadarajejonakupevodiju.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/86233713211.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fabg6jn58c4cfkqnbsr0jgkdiq/38519615.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/dinusidezujasanasawodujak.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80b1d5e642a63d5b29867ab68117bc95/labukakuwukifijakutidazed.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/zefivezutin.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/sopufuduvasenog.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080587480bba---47208343250.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/86492637832.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/xinipofefomopigumagikul.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/dodimokorotakoweloxexapax.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/56605720185.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/fosupabuwagoritagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=beko+washing+machine+9kg+manualPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10980 bytes
SHA-256: 9920b4939af6d8dd1450ba48ea40cc3576ec326540c6b515347d1f2d9706e4f4
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 17424 bytes
SHA-256: 64b3dba8d163703535368c70ae0bd07468e5659dd80c6d503a1093f315c130d9
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1