Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2166d8b4f0785d8…

MALICIOUS

PDF

67.3 KB Created: 2021-09-05 10:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e33d815741af1ee290e0a1abe8e7958a SHA-1: a4d23c32e663c03d032ccf8af988832bae498265 SHA-256: d2166d8b4f0785d8ea876734b87d60d38dae4f6195f7e2043ae4afdaa5cf04aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery attempt. Heuristics reveal it's an image-only document designed as a lure, containing numerous links to external websites, many hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct reading but rather to host clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=visioning+workshop+pdf PDF link annotation
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/96416552644.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/86d7c6399f0f684b33a734c5d9a886f3/44369918909.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/11990956788.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4801a019972b1d2c62a859ac3502fe17/vavezuketifibijejo.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/4291718388.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3gi10c81v9irkmsmecb9g59jj1/72299412134.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde5bb201a---napanozarirozogamemi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e1dcc6505355692894060a980d42b97f/23063748134.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bb84a8b7---17933438996.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/83620427771.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8r34l9pvso82gt1rk6u4vrpm37/50553215842.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/fea52b92b748268a17e9472a074095bb/roledeguxuvomokagetenura.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/48s4dopv3am487srak3d6eovjg/kutabejasokutizilube.pdfIn PDF document text
    • http://aps-mes.com/files/file/setexetawovasexesurukami.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/xidegivuridevo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c068871b13b---xiwebefar.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/woribilupifonaxeviwetat.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/jubexegenanebukenok.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/932a25207a93759e1af914ef434e17c6/29259334737.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/97197129319.pdfIn PDF document text
    • http://ha-sine.com/d/files/kavifutabuvizu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE42 10484 bytes
SHA-256: 3f0be2a1355832afb29ad5376cb627d425dd977590b6dca3637b65b9d450d3d1
font_01_sfnt_off0000c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 14028 bytes
SHA-256: 055a49f1a7fd616712103b554fc1eb6dd4378dff63a3578bddd744915b71ed9e

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