Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2fd7f41322cd2c…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 20:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46d20fb8734f4afbc23f39532f21d7b8 SHA-1: cbb4612e1b408513ef889fa5b1448f9925c13160 SHA-256: 3e2fd7f41322cd2c3652dad1e9ffa702e75aa6c696a1309b6b3312d1de266ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elrey-uslugi.ru/media/file/86472100858.pdf In PDF document text
    • http://gianniarnaudo.com/userfiles/files/wigof.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/jugizofe.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/fumegudasimevigegumadekov.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/8814210188.pdfIn PDF document text
    • https://dulichsamson.co/admin/webroot/upload/image/files/65713447929.pdfIn PDF document text
    • https://polytex.de/sites/default/files/5801419074.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/46691503385.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137058aac99f---88495718040.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138cafe16c19---94195613921.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/juwigopidilotek.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/38246859282.pdfIn PDF document text
    • https://siroyensao.com/upload/files/27826061475.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/fomakexewifaj.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/diwexituzazujavikufagi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16158face0589a---zarusa.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/80385253250.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/rejaxukegawigefiba.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138db1fb5622---salinalozabixukutalab.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kameliseruxopot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=parts+of+the+butterfly+and+its+functionPDF 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_off0000ad3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 10928 bytes
SHA-256: 72bb3906d13a3c800ab8670d3a2c7829a9c6d61b131c995c60a31acd0f0f555d
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 16244 bytes
SHA-256: bccb385fcbaf873e01a58e68d4ca82ec18d833a0115a1c5a0be3ec22925a2e95
font_02_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1