Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1ccd7a8b8a16db…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 11:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 434329ce708869f62aa590e71825be58 SHA-1: f522da88fdfd624893a256e15af456334ba2fe02 SHA-256: 6d1ccd7a8b8a16db96e6811f6441ce8b7db0b924f58f5c495a857ece5f42d9d7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS platforms, designed to redirect users to external sites. The heuristic firings indicate this is a phishing and potentially malicious PDF, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b1597a94---5488668829.pdf In PDF document text
    • http://valsadindustries.com/userfiles/file/52957528999.pdfIn PDF document text
    • http://sgpeo.pl/users/file/dubefiwiwuna.pdfIn PDF document text
    • https://kopari.hu/files/file/8875039920.pdfIn PDF document text
    • http://wohingltd.com/userfiles/velujuvoxazijab.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/teduzonawivazu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/65786928488.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f30c90ba2357b0fa337119df2160d80e/womesupiwijaxapi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2362642cbd6917e3dd3c79af1f35415/20589419061.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/seweronulozeladejok.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/zarofovolixagirenu.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/93245601161.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/givew.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a78db01d7b6f174efac97268ca0d58b3/rabetanakiranizowez.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408a8bcc791---jofiwakosex.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/rutomiginizow.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1e0c1d0a5430c3447bd661ffd6cbc1e1/katirevaxodejixunefo.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/bejetinivam.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/tuzasi.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zupop.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/40217251723.pdfIn PDF document text
    • https://matratva.in/userfiles/file/53022836633.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28819186555.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/47972549202.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/zojaxa.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/62602354334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+moon+black+2+game+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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 17932 bytes
SHA-256: 857c510d88b002960c581f2ac811c36eb0f8ad968d76987069d20ee903136937
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 10696 bytes
SHA-256: b71fd08d7dac020384d0ccca30e47e6f7c5d435e4b858093329f2a53e367ee75

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