Malicious PDF — malware analysis report

Static analysis result for SHA-256 334679a16a52f665…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a51a2b271927d823cb334a2f4fc7b28 SHA-1: 19122371a2bd302d6d89cc086fa0ad2087dc1848 SHA-256: 334679a16a52f665cf10dadac2b1bc3278b344f7ae2bfb2d77a40e72f22ea957
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=gmod+fnaf+android
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nuboxasamolovisif.pdf
    • https://beautifulhairstore.com/upload/files/rumekebiroz.pdf
    • https://smilaxlabs.com/userfiles/files/66107837313.pdf
    • http://capital96.com/userfiles/file/98259156558.pdf
    • http://autoneza.cz/UserFiles/File/88773343963.pdf
    • https://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdf
    • http://viettelhaiphong.me/data/dulieu/files/8168819577.pdf
    • http://www.farmaciapenil.es/userfiles/files/64249643055.pdf
    • http://radis-rrl.ru/userfiles/image/zokibejaxiki.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380bc21b311---14356990307.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/89884691387.pdf
    • https://ketdoanbus.com/webroot/img/files/72469755003.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/xexogego.pdf
    • http://studiomuraca.eu/userfiles/files/29468270127.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/dawume.pdf
    • https://dichvuketoanvn.org/uploads/files/64046969408.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/motosi.pdf
    • http://rovitek.com/userfiles/file/xopobun.pdf
    • http://cottoneauto.it/userfiles/files/74400940833.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613206d841730---tamenij.pdf
    • http://icoenergia.com/userfiles/files/67108945022.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/76286609479.pdf
    • http://ejmk.com/ej/upload/files/mogefa.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8d66aa2cfe4c4d280e16e18d5f7b9b3b/zufijapivakanefapi.pdf
    • http://ccspatti.org/userfiles/file/16007733236.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC30C 16792 bytes
font_01_sfnt_off0000db23.bin
4801337eaee5c76b85c73cacee9911c50aabc3eceb33cc62006ed7bd67c18547
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 10108 bytes
font_02_sfnt_off0000f195.bin
f86c8a4520e28fd496d1d339f289f4e6eddee8bff028c21531c5ff9bbb451aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16772 bytes