Malicious PDF — malware analysis report

Static analysis result for SHA-256 af60da973e730b7e…

MALICIOUS

PDF

92.9 KB Created: 2021-08-17 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cccd28d3193f996267417abc2ef740d6 SHA-1: 64ec0dcc07c3ac235dfff5e076ae51cc707ef1a9 SHA-256: af60da973e730b7e3db5be8b4fee5488e2f5ae91e6c74c5d7c46a6bacd0db7ca
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary purpose appears to be facilitating initial access, likely through spearphishing attachments, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fouladsazanco.com/Upload/file/72123000432.pdf In PDF document text
    • http://lenosada.sk/editor_uploads/files/87386754997.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842676503c---zarimizemukurotuzorojizel.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ajp76d5n3op7qs73p1jf10un0s/jajopijuxa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e7b37941---rizepegotam.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/26749098392.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160778e65e1538---56812989367.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e4f7bb1eefdcb9cce6310d365c2abada/terikajaro.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/zikem.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6e953495---kivujikesiro.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/sitalasunaxebataxako.pdfIn PDF document text
    • http://www.grifin.sk/files/16781045179.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/64457740829.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/subiwivugukuxuto.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/gojazivitewedufuvofived.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/tedegemusu.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/70071325543.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/8513140836.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/91659038354.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zefaxorasazenenoxugivimu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/8256827057.pdfIn PDF document text
    • http://gibisch.com/files/files/wazedifokuwoji.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/7508521728.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88290373496.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/15940686478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dometic+3+way+camping+fridge+instructionsPDF 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_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17620 bytes
SHA-256: d4c3748d795149ac7eae3e4898accf509bef3f5b1cf029e93b96a329b35a5b59
font_01_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 11388 bytes
SHA-256: 65bbf569d393343f5bd582b8b0add32c8368c64cb2e76ea1b9d437b3e3d68f29
font_02_sfnt_off00014cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1