Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5b4fc4698496a1…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 20:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd18f5ce61082cf3f954fd820e9e8142 SHA-1: d34a4580824a66b2d4244f2e9528acc246f8ca1a SHA-256: 7c5b4fc4698496a1e862a29dc1e3ea67c2b6533290f34108e070bdfbf3def4a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's designed to lead users to malicious content. No scripts were extracted, but the link farm structure strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/373fb637b9249cb2ef22cdf4b7911839/90163399037.pdf In PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/kenokixamefizusujiwimamo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d25b7ab0---13804798948.pdfIn PDF document text
    • https://curvy.tw/upload/files/24557141766.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nedaroked.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/713950fc971105b3c42d882aca45caca/4518709920.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/602a58617d44dd04ac0be95d03f6c396/xasuzi.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/65726260866.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/libuxekutofaxulabul.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/48554001927.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/78933181886.pdfIn PDF document text
    • http://rsst77.ru/upload/files/10717595205.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68865141475.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144b08ad159d---85473683279.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/24952676001.pdfIn PDF document text
    • https://simorgh.it/uploads/file/20311011382.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/23059069593.pdfIn PDF document text
    • http://edituj.cz/res/file/39426796170.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/87732742519.pdfIn PDF document text
    • http://chinahongji.com/d/files/14806402632.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2k4ev04o9emqbp2gqhstkmugaa/3232498774.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/burodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=slow+motion+video+banane+ka+appPDF 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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 10744 bytes
SHA-256: f41f22ee832df6c9d1252f49d3c1c08a95389d4225d658994159ffd5415ae5c8
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 18536 bytes
SHA-256: d32942dbf437599be55f1decc2fc9f3b319b5fb067b3d7d96010d971bdae1165
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1