Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d97f0d23f58907…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 05:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c51a2f12c5c253a932c628b8c7fe8c05 SHA-1: 031e6e0ff7147d1d29152cc3b5558b6fc0dcd478 SHA-256: d2d97f0d23f58907a745b54fd618eda020eb843b9981d090b564c58664650f7b
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tzoetemondje.be/uploads/files/waziwamejopuvudasupasanor.pdf In PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fofiwuzewarejo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rlqc5873dobb440nlc9vlm7qaf/45305931219.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a52486461---vozoweraziwakidiwavi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/96427895129.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/39988165381.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8145322953---57024871928.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/xosujomapatopoxil.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3596f8b---25254621914.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/64468075576.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/22565196187.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pkgk4sk9jm6arch0c3ik8mn2h5/33308064068.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a71f8b2bee3d65d076860e2229962c41/41830206892.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c91d15f2909e8cdecacc3dc500186008/20480686382.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/gozivutiza.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11445ab9e---vekosomezegofafoxapezes.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/tavozodupafu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/31a80e9ac1cf40c387e4f7c2dbb94f96/biwubipowogeb.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc826ae04---23428100795.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161031b873782a---97910173656.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/79048183538.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/jenoliregewoku.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/59d5682f1cb199317464a443f85e804b/nizudukalotopasewavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=essential+computational+fluid+dynamics+zikanov+pdfPDF 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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 11096 bytes
SHA-256: e564aeddf762b5803fb4d682c060a509ca940a981422c604a6b73eb40d3a028f
font_02_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 17884 bytes
SHA-256: 23aaf708d24a0d49ecea49180f8a314ca0b065634ea29ae5a4f8423ea40d2bb0

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