Malicious PDF — malware analysis report

Static analysis result for SHA-256 5426bb407f39ad43…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 12:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cf1d2319760f157d49bfe12a407bc58 SHA-1: 69e56c264f0bf20333b4ae940f77195e192e75e0 SHA-256: 5426bb407f39ad431114b68af7f132a8a50999f3efba9702e0fe19011654a02a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to multiple disposable or compromised hosting sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs supports this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://esenkardeslerinsaat.com/resimlerfiles/17826986164.pdf In PDF document text
    • https://ikima.fr/uploads/file/lerokinevivenuxogitoxono.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00170505b---25696798274.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vcfd37kpjlbc89b74kg77abg12/55181526623.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/34d74c4621b6e38ec210f80b7b0a34fe/rozikegedasomipa.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xafalurujanib.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b22f7b1e87a9d68e357e49e2362d24ed/95874295801.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e0ab3c0d---fewiwifatediselefisiwo.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/14937533202.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fodibeseruxekosomidat.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/78998282373.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/fojulimofulod.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sdqhucs4euf5jmu5avm6e68per/lizemusurusi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tidovawife.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d9d1b3005b85de55707c57617c6f8500/madakiledupijuv.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b0cf4a0d9777b5a5bff3baae443dd4d8/8078810927.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pepuwikelifudimolize.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xapubopajadepak.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108141134283895.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c871d5d2e10---49070979764.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a7aikbovvlmtnerl301503uro3/73431714784.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/jatiletu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a97116656e781b9005a75f2aa1aa15f4/bogivejipefumoduvum.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216fb59571---16697528503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+tanks+of+operation+barbarossa+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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10744 bytes
SHA-256: 5e3562a8b88337ccbf32fe9aef9e39ac59361132525660d1d3f9ed7e5d3f3699
font_02_sfnt_off00011791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11791 18308 bytes
SHA-256: 99005346cf32bd95adfcf1cd7f8d83dcee608994f5e5460bf91217cf66942ee5

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