Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c347db50f2f62c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 08:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa5d1270f2a5b930a835343b61e0b8de SHA-1: 97f41233f3f194cb288b0fc26fc9af855d5b54a7 SHA-256: 59c347db50f2f62c58bb22e92c6988c19b5acca3587107f0b5f9b8774cb5ef6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous 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 strongly suggest this PDF is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=alister+mcgrath+pdf PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d761afced---70600608167.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3100a588---16033162749.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/14447609806.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/27613652026.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/52916212695.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c86f6a17c36069b9ea4c1622c5b8c1e5/79476728709.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93ad978a87---pedudex.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/debebijolato.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8g8v8cbh1hbam03p7rkm1k4lr3/mebotorokikanuzide.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/90b6b3b79e1f86b2ea91d8c4ab2748c0/miduruf.pdfIn PDF document text
    • http://4bx.pl/public/file/tikolijonin.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/68929717881.pdfIn PDF document text
    • https://aashianarealty.com/file/gekugoxalaxidubalu.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/petoxonujokimaxipiju.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece36d2b55---walazeworev.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/13381235692.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4d22e268a191a1d8e2206946e049640c/69981773988.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959695cfe35---jasofidedemuxem.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/66743500409.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zapelakinisuxofo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37k6oobb30ja4bbu659i7n57lq/vibagawa.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/92144120149.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d2a8b132786cd8bbbb803efe1285b76c/vibejovomolo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/xuvulekora.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/lulofariwiwafujesigeti.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_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10824 bytes
SHA-256: 41cc2f8736cb0d1702bcb18c9128ae1e7efb78d03bf101075af73835bc980778
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 17544 bytes
SHA-256: 2cfe94f3da5bb55dda34d54448affc7cc5347398c9e9ae037b0fb4b58a33127b