Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6da754bb7d8779…

MALICIOUS

PDF

85.9 KB Created: 2021-07-28 14:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f6a595b223fe1ddc1c609e0a87cb566 SHA-1: 9a59235b931fd44a73c7992d8e21d3c44602c8eb SHA-256: 2a6da754bb7d87791750fafdbd6c2ec8cfae8f5d2e1ceda17efc1de2c947ffbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of JavaScript suggests an attempt to execute code or redirect the user, likely as part of a phishing or credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mfdesign.hu/files/file/toduna.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f094b6e39---rinovunulexaxir.pdfIn PDF document text
    • https://alutat.com/data/file/korijufobinuve.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/49728328975.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/bexugezerelafiwejeru.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/fubizunavi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/79341143497.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f7acb5a1429b3cfc168ce12dabb10450/nirunarinidumuwe.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/0039499cacf11ff1111efb0b7d4c7a77/jafinumev.pdfIn PDF document text
    • http://ned.ru/uploads/files/57720556583.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1d4a219bcb58bdea038d241e4dcba221/baruzapubane.pdfIn PDF document text
    • http://askort.pl/Upload/file/44048307235.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9385a4855---11683100574.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/niduxitijazik.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797a1d35d02---40576890528.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/51536507634.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f59b6e72a---zavafazin.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c3gisdju21ovf7ah6pntpe81l8/riwetoweveluvipaxaf.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/finupiparikalodativ.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/zumabugezupimat.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e9370dd339fcb5eebd2e983cafd116ec/92968896028.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/xagojojiketimubewenapaxa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/72094199119.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9167440c6e458c161d43a9904d5a8713/94644907197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ayyappa+swamy+songs+ringtones+free+downloadPDF 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_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 16748 bytes
SHA-256: 2fb9468a67da3cb87e6f7f4bc5363fe77e42c08ddef49c40f21b179699d5217d
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 11020 bytes
SHA-256: 06cc641dee937802ae0130391479d14759d33ebb29182e492e39a7d9fae09d44

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