Malicious PDF — malware analysis report

Static analysis result for SHA-256 b927b7fb5ff4c907…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 11:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e146b00d0b85483414ba776079814ab1 SHA-1: 82d711750e63563dbc59619598f403afa770e70f SHA-256: b927b7fb5ff4c9071bfecdc79c28e3051849c985223a39b6ed7405bfeeb4a9ae
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate a social engineering lure to install browser extensions or updates, a common tactic for credential theft. The document body is unreadable, but the presence of JavaScript and numerous external links to potentially compromised or disposable hosting sites strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=select+all+history+chrome PDF link annotation
    • https://gamepinleri.net/calisma2/files/uploads/73725680708.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/99803367642.pdfIn PDF document text
    • https://shevian.com/images/file/labobujokosoboguni.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/18067051234.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/vipexumimupinazekarobalo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cee85a5d---bujivumijamefikomulokavu.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/87240701300.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/miviwuzulupazaruzama.pdfIn PDF document text
    • http://ndt-ultratech.com/files/kunusazazujodapu.pdfIn PDF document text
    • http://stylekd.ru/files/8094325457.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613917e1cb01d---48790695530.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613994dfb936c---3549481860.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/98705741885.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3401f178196964ab0004cb0c281a9f44/71615430692.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/80482445112.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/katexodudem.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/36250990177.pdfIn PDF document text
    • https://grancom.by/upload/docs/12422979273.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b02a1e26aac4fabf1bfc6b01c587e8f0/68583985416.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/fulovamikumumi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/gezadebedemorotem.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vibawomorifesodilo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/bizis.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/28294422523.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/91381073139.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10580 bytes
SHA-256: ff7c51151277b44bb0c848b30d9204617494f90fc81b5d1b851a4ec5d5121f6b
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 18284 bytes
SHA-256: 3aa9585c164fe6cad7e3ca70d36b291325ca5cbce5e6a2c5c0ea653aec8344ac

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