Malicious PDF — malware analysis report

Static analysis result for SHA-256 181bade9acbdbc45…

MALICIOUS

PDF

103.6 KB Created: 2021-07-02 08:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b87878977789eaecf95288c8a001af68 SHA-1: bd384694bc04b1de3b803fc791b31febaa469601 SHA-256: 181bade9acbdbc45a91b5f805f23717e9be773afbf7a418ef2dfe2088e70d846
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://atraba-holding.com/userfiles/file/60365329572.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf0444bac---13240526363.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/roxugejezirobetudefofun.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9f1a9ee9e817ce03bd8b84f5d8ed0a77/senemubuziribelikamise.pdfIn PDF document text
    • http://ridendo.cz/files/file/50562733589.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ea2ad8be2efa5d80a0cbf31d6e1191fa/nimidoruvuloja.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aac443f5d---fexora.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a823cb1e686---gozepamukemudiwovuwul.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/51658917129.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/rowamesomutixir.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6aa2b41c2ad085072e24e1e31129981d/27867701689.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/crulqfde0eqk3einadg4sfvf8q/saxifere.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9d767123---24216539032.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61aaa0fbe---18563695928.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609facaf094a3---xefugegidutiwaxusapola.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e7f721b06---jugudaxikapujewemaxu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/98280305365.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/pawofubexuwixalitejokaxeb.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56266802e---kogunibojebagapajepota.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/91855136263.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/91499732044.pdfIn PDF document text
    • http://benetalent.com/upload/files/sobesa.pdfIn PDF document text
    • https://davaocarrental.com/images/file/5797112501.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/metagerobirupujad.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pp8r7knpl6nf68aepq11kso5b2/sivowunino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+notes+of+biology+class+11PDF 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_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAC 10860 bytes
SHA-256: 5bb4da082d7d6badc68d29b3ba4aa088cbd3aac44b4e9376a2e57ff589c8bdf6
font_02_sfnt_off000163c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C4 17340 bytes
SHA-256: 27e4061a9a96b028b24f1f456cee26df9b9308eb1331dc862e6289953d72b796

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