Malicious PDF — malware analysis report

Static analysis result for SHA-256 339522f82b975437…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1169d6933974c9b88dc57c6365ad8436 SHA-1: da7cdec760868f17b52fe579495e9e9384048ccb SHA-256: 339522f82b9754377e28ebf498e958098416a67776264fa68c2e805d473ccc37
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution lure. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=memento+genie+electrique+pdf PDF link annotation
    • http://sobsai.com/ckfinder/userfiles/files/48075324444.pdfIn PDF document text
    • http://saktigroup.in/uploads/denawudur.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/37305638192.pdfIn PDF document text
    • https://euchebnici.com/img/file/48811167425.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/sutisez.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4bdd7bce0---jonobodajafosok.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/29471747352.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/1290897249.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/7781439888.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/gotaxutulonukexuwuselox.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c902dde1188---depudegotipaz.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/50936442796.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/47041964133.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23909194915.pdfIn PDF document text
    • http://vce34.ru/attachments/file/12572977369.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/92231551096.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096a05d76478---2220712837.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8b4db65e8b76cc06e76131c7f553b231/nonabupurivovupasufel.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8cf3b6e64fecf1547ecac592b63c36ab/dagevogawipufoteda.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/rosuvegabaxewesuzulu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/05c3802b6081a9759a48e171c8458850/78928406614.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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 19100 bytes
SHA-256: 83b2ef3a5e698a6c29eb5adf061e06ab6ab9daf1814c8a029c71d213e6109287
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 10872 bytes
SHA-256: a2edd1edab312f6b30da5b02589d96d4aaa4e2f04cd894327064ddf77c8422c7