Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd544ba3e4856ff…

MALICIOUS

PDF

65.9 KB Created: 2021-10-02 13:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5477c56710986b3a7649490c997547f SHA-1: 558ec02e2802f1a7e6c8eded1ac8611c8f32ed59 SHA-256: 6bd544ba3e4856ff5699eb768f9f5c8939ef5817dfe58fc8da67b4e4a11add81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking on embedded links, which are numerous and point to various external domains, some of which appear to be compromised CMS uploads. The presence of multiple external URIs suggests a campaign to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 65 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://irlanc.ru/uplcv?utm_term=leave+note+to+principal PDF link annotation
    • http://truhlarstvisollner.cz/data/file/satodakumimugisaw.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/36290858093.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/xotuxavapirixulodu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vuraxogome.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/93708632305.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/pidizevuxef.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/6020178158.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161538e759bd81---zobivovabubuduwomusuvapu.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/difagojotizeliloxetuno.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614cde335e9c4---tanuropamenefudane.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/padotalopulixodufip.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61262898821.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208ce90ceed6a4d2f1a87c65694fee14/79572613473.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/93716741772.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/74466571251.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/sadarinew.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29dd88e11---62737516521.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/rokufadu.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_off0000a7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 10224 bytes
SHA-256: 13112af255c30c3cb5d2f05de07ab204fb49d9baca59c3f28413750229bead4b
font_02_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 14160 bytes
SHA-256: 5715ea2f51ec6b8f9ad1f010b8f095086e613954636e287a97bf16d1009080c6

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