Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fd98ad1ded352c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-16 09:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 163a49de402acbd3d87f8c8da61c276f SHA-1: ae8ecb86488d09e932ea278f7a57cf0965764df6 SHA-256: 10fd98ad1ded352c40e8a8a140b5364e3d6bcb1b79d373b92b6a79d4a4026ad9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to WordPress upload directories on various domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=the+spirit+of+obedience PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/f15f70vuipe93anq0jef7u7d6p/darixevatu.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/51415740441.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1992dc276bfd7f2fff1c876fb5921e31/kumani.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/b2ee05622bf291341316a21982597d11/13243387948.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/93260585742.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc0b1c53e---mafaxisok.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/9016319764.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/rorodaxotisuvezik.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84a911a92---kekuzurirapegigifuwidut.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074476614799---31790704447.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2074dce8951e3b8414ae125478fa321b/nugisatanakavanibevozepo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa90b79d2a---85767501759.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b733b970af7---goduxokuwinajosijanup.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/tebawegufojivuzo.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/12663988985.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/5708260976.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7u56cun9ig152j7ljq2mvph3il/91406857462.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/afaf92e682fa922175a0dab057ecf9fd/47912211874.pdfIn PDF document text
    • http://hydrem.ru/images/file/85354074829.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edbc33e78b---38253192861.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudag.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ba2d04ddf4fe402777debf5608656414/rewuzizu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2f8e4bba5dcfe706f81b68323a72a5d5/35818103770.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 17200 bytes
SHA-256: ddaa413553ba01d1fab8fe0c1a98057bd44fd9fc2c91e29535dd93dd65626038
font_01_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 10612 bytes
SHA-256: 03b11d559043ae7fd1f31a9e19134da2c048b80eb5b8327f3fedcc97e7e4428c
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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