Malicious PDF — malware analysis report

Static analysis result for SHA-256 d345343e29fc5351…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 02:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cdd85cb639019cfb47c94a96b47faa2 SHA-1: 73cb4c832396dac5d11068490a887360c8aaf867 SHA-256: d345343e29fc535116bda1b68d6511f2fbbb587c08272611d198105efddabc31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=assassin%27s+creed+odyssey+download+android PDF link annotation
    • http://rem-proekt.com/f/file/tedid.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vajugi.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/32157056809.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1868339999613adf5eb8f58.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/5562102069.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67d94e8b3---kifokadugovorazibozekapum.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/wisevomiwovowupenavaj.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/72663236462.pdfIn PDF document text
    • https://cityface.cz/res/file/76757455967.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/9777076389.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/51554669319.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • http://ge-mak.com/files/61933101108.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/46566448139.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xisodubebipezunomede.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lezazetopalumup.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/4726989732.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nijesubunovu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/nalibenenowilisumo.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/nunarategomepef.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/nddnkdia7b1rhpi7rg8daioltu/19010981953.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/68728135462.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/3872788391.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7904b08956a13b9dec4a56618ff36577/tebuf.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 10480 bytes
SHA-256: bcace7478a0652240033537a808e0c391b74ae809d6188cc6b63de66d85fae47
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 17912 bytes
SHA-256: e8e6cfe824d561dec86ec67c7e2069951506ff37b0da5044c7a6dd4568095d71