Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a241482ebca094…

MALICIOUS

PDF

58.4 KB Created: 2021-05-20 16:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76fcaa8678e7e5597e145006c25230cf SHA-1: ae8de02dbf82143dad788f96cd7ef81b30542fd3 SHA-256: 85a241482ebca09464e21bc263b0ec314da9d32730141eb770f35ffea0782372
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and an IP address, likely to download further malicious content. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8838

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15d1f88806bc5a41dd1c487948060849/vusiwes.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9d6598236d0ab5dd93c44f5d03ef2861/20733640698.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe4a8a0fd---51783125157.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2695143669---20027460274.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ae1d64d7d884c002345a5cfae9e25dcb/niwebijo.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c086ded1---punurovi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajjed2so7iov803q0hg71gmilp/pinivituxuxuxotelimo.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7493c2093eca4da46d57458af6f54f83/deduxizesanilipixitebutet.pdf
    • http://asja-doll.ru/userfiles/file/83408115606.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c022126fa7---dukakafatisunejulabekuta.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a03d6510---26840020754.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b92ec25d---32781162986.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072445a8809b---92595182967.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/fasidusulonagor.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ad602ccc---64555387250.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/67553039471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=madea+big+happy+family+play+free+online+vmovee
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin
b0736169065c7baae2039cfe48336965721579bd4f4a332476c5f194f1db53bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 5584 bytes

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