Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e24b83f500e7813…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 13:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2000732be9a6decd98a6d94e22c5b222 SHA-1: 96129e1e2298e9ddd6bb60870acf5155b8b30662 SHA-256: 7e24b83f500e78133bdc506c4e8936d56ff52276ccf212eba0349e9f71a437ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d6fe80a82f6adb7f24cb31da9eec6236/90982577180.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/icefic36efegthhibpmkpvsoin/ligolixevuz.pdf
    • http://zovsh.com/Uploadfiles/files/98855417551.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1d8330bf---xolanuge.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/208974ddda8ec7f7069ae58d5309d1c4/dudajaboxipamanexepu.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3agj93gg0tqb7jt8b0ha106lrm/karakigopolijeva.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f3d88225---jitawonoluvaxobogo.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7d9bfddc---41373580039.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073a015204fc---nigadetobidogoju.pdf
    • https://personnelcle.com/userfiles/file/37548643199.pdf
    • http://proxima-design.cz/files/file/lomokavutuzug.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lu8sui44bumgq0o7f6h7l8r8a5/gelikano.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/99f29088dcb1c89ae8a6c5da46b6609f/rulini.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2dpk23vchkmdi7or96ais0adq6/mebevibulipufidexeb.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/35f09c3ed50fbf1eda2f2c518807118d/72861199227.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b319c72bb15---molodexelonikiba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mechanical+lifting+is+not+as+safe+and+comfortable+for+an+individual+as+manual+lifting
    • 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_off0000eaa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 16792 bytes
font_01_sfnt_off000102bf.bin
92ee94d7874ea71f4927da77012f9744b5758d07eec8efd2762e4eba6a77e889
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 11220 bytes
font_02_sfnt_off00011ca4.bin
145d0f90f0a1078d069facccdd3d4b53165a19bd1f89ca6f5bdda55459749c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 17572 bytes