Malicious PDF — malware analysis report

Static analysis result for SHA-256 395eacbe318c8284…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 06:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2141ce4fde98292ba010848e1d9f1e0 SHA-1: 302042ce0af3e36a39ae3cca2ce47caecf76a464 SHA-256: 395eacbe318c8284817f7ce6607016b2cb11796b2eaef4448d9bde67149541da
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a spearphishing attachment to a document that redirects them to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://godahoian.com/app/webroot/upload/files/tixebanek.pdf In PDF document text
    • http://groupkaishan.com/d/files/42105745670.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/kasoxevomumotogu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/94051847707.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/62318825567.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/ramujevobaz.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/88374092691.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/9887667665.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/tonufegigizewedigurap.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lawowuwasokelivopubezale.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/7016285896.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/luau7cs9p7saimi3il9d2beup2/xukaturugoxibapenan.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/31793921379.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/17936444587.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613409d6b1123---25558406579.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5525f09720059dc0dbcbdf5cd4b9f88c/kovibuj.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/luvowebepifuwirujibib.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/69190052692.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/51554967843.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/10436442230.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jixuze.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/vatawedewatole.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/kodorapikox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wordpress+to+react+native+appPDF link annotation
    • 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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 10520 bytes
SHA-256: 7b7b87cb8cda4e10db1d30947b4650eb712e25070bb570af7fc31ce39d4bf372
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 14984 bytes
SHA-256: e915c62036a7f0784e130de6255f2d9d0dd054087373691b5294cfbe8c98de28
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1