Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9efcb719f97b672…

MALICIOUS

PDF

88.6 KB Created: 2021-07-23 17:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1365ced26a3756061167c44b50465a3d SHA-1: 9af8b6a496420092e3ef0a143a193d30e3a35a47 SHA-256: a9efcb719f97b672c45cf28cd2dc2240955ecb38065c5703106f428332a189bc
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites. The PDF's structure and the presence of numerous links to potentially compromised domains indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827b60a5669---74476233461.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790afc5e8f0---tidigebikolur.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jd83evo36hcrh8qb1ftf4huid9/bawuzubekoxel.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kkfsj8207tp2rh9a7icieirjae/jirum.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/94433201004.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5197614ca115c535bc8e8a66651efc8f/41938550582.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/72051730308.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/685b4d81f9cd773a0b022fb37602496e/nitikinesowibipiparolo.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/tigazakuvalogubip.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6ce38e1fc88e12089567ae556c1a6e66/natitikixovob.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f03a60d983b0a776372d0fdd07d75347/razorelexavapogarexu.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33730371468.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/37359666127.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/8978751024.pdfIn PDF document text
    • http://pi-consulting.ch/download/19515997812.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0efc23024---11782662708.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/40674481711.pdfIn PDF document text
    • https://hirurgija.me//files/87468220267.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mkumgmrnnmje0v898i0b946k7n/38592136029.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8d74d9b5dc362ccc8d28aa3ae96eedc1/99280785671.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/vegigudabubez.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98decd3217---basuluruvikoza.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/68264424125.pdfIn PDF document text
    • https://rcot.org/userfiles/file/susudemulexudopefugor.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/mozego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+an+ember+in+the+ashes+goodPDF 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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17632 bytes
SHA-256: bef7c20d8b86dd2eff70f515473802d3315131bafdbde438e49cae53782412cb
font_01_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 10740 bytes
SHA-256: 6bb997db735e895e1478ede735b561c50d875d3b444749cb0751de6addac9c0d

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