Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f4cb58b8f7c523…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 02:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cb960516a9ed06dbe9db0d4a595937b SHA-1: 0a38aea2dbc8fde29b2f25f03a1af9bab53e78aa SHA-256: a6f4cb58b8f7c523f50f14bba2ee2a9ae368b56592679415f23759e2f318c7b3
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly suggest it's part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://shoreluxurylimos.com/userfiles/files/40413195559.pdf In PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/sugafilidepepuretuwedazi.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/36939016805.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/77668331450.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/zamobonugudipoxik.pdfIn PDF document text
    • http://alltechsro.cz/files/zebewaloveduko.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/21574926525.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/41532688153.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210913213052.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5b548cfcd9cd8f8a0d30b236254f22ab/jibiledadekusi.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/rudurelogejogiwomeb.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161354895c88cc---ravawepa.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/25757102450.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/bawaruwanabu.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67629115564.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/41895d0f5029777d3a3bc729d29d4bb4/85557020343.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/fojejozudidimopul.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/18179873117.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/191982793e2e570e2eb938d135deb8ea/62642853543.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912023919426520.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wizasajopifuvumez.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba8159b65---nosipavur.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/mowexunakubokijorosite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=final+fantasy+war+of+the+lions+romPDF 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 17084 bytes
SHA-256: 3f5f25cdc482ff255260d1716d2ce95942af3d1f5d954bc4b7e5bafab3fd1485
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 10656 bytes
SHA-256: 287be49ef13b9b16c765da2333830059435878142749075573442d89a6582604
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1