Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a9a14d475e92f3…

MALICIOUS

PDF

59.4 KB Created: 2021-09-06 06:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 89194ac50801b9d030214af36033d54b SHA-1: 76e8c4d51f0c142ed2929a31c763c0f14505f4d1 SHA-256: 31a9a14d475e92f35c318cb6e11e7fb6d1141e317015723d6fc133f0728a94cc
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8130

Heuristics 5

  • 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
  • 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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139e7d546b---gekewenegixuna.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609018cda3b91---59854341846.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa49731ffd---xepugoxofufixirusi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73df239968---leburaxadulimejopomozum.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2erngrd3q66p2ih8vfapfv6526/40792456616.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/39eb872c6982414ae9ba497eda0f6e32/niterozitusofafabibale.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/pewosixomuzupilijas.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11520003674.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wulazutaxovimezajujo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f0d9cd2dd89ace46258d8ab6c8a33905/dilamemurunagutire.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/cc41610fdcf4924a0ee6833e7b84acc3/favek.pdfIn PDF document text
    • https://waroproject.com/file/tofijavututef.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebadc3d6f2---72787894152.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/24064871793.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/52329774852.pdfIn PDF document text
    • http://wwstationery.com/files/file/84535228674.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/26342aa7aae063431eb6697800a9aa23/45657120660.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ksnsr43dvragl173fjtal0ju7/32720476200.pdfIn PDF document text
    • http://cecev.com/stockages/files/xerewo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c459b88ae7---lutivevosudevibusejozadi.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/nefoxapudozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+for+gopro+hero+7+silverPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10748 bytes
SHA-256: 43a8ae4987ec94d44a2641b13d5bfcd2e85495ac8b15a6c10b2b96da7449f47f

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