Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9b04803a6e2ed…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 10:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ed54e4d6c39f98ceba2f331a730b7ff4 SHA-1: 3b562ce2a17401be491811a992722219b646c894 SHA-256: aef9b04803a6e2ed2d26370a70818c95855fab9264e43d5115559d582e9612a2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of a 'download button' lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=vn+hax+pubg+mobile+download+for+android PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1mkgmv94j69gka63d4ijerj1f1/36470155962.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e46b5101---30418088040.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160927ba6425a8---xexajatabegugodetuketod.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zobowuxu.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/puzezidedilonasazu.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/vamonikuworulinuxu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2d3e2d3d28a573f31a8193f2d6ed68dc/zarudigigunolex.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052d188dc1---sadenivapoki.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f4987c77---9898431520.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160764ff70a4c6---nozudojubeworo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d79eed4d---35775304096.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b44bd71092cc013f9cdfb417f0864dd2/xakomurivika.pdfIn PDF document text
    • http://fullx.net/files/82140370503.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3bqckpsao6cikgeeaejvajec8c/24326622167.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1b4f30739f2cca19f32bb99fcbf66885/nejevizilakiwivexebinip.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608315f0060a5---4560393327.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf09bc94d---18339794870.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/82f0d2fe9fc7fc9ad3430bb91e9054f7/9001197170.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac239634ded---18995270588.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/4jiiab0837a57muun15bmri6d2/vigose.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/22305058017.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dexunod.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i091h1elk0kntds2od0q8sjs9/gupuzezexivifolawitema.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 11076 bytes
SHA-256: f9273a39f61eae095113799fe882a7721262d3c824dffe9b276481279ddff066
font_01_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 2532 bytes
SHA-256: 465d71e8688b2618f5d3d6650820773752d376922f250ffedb7ecf5926f0b1bb
font_02_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 20348 bytes
SHA-256: 61128597c4f39f1d8e62ba7e93ff5f2934402b2c81a2a4f2c9b10cbd3e5af865

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