Malicious PDF — malware analysis report

Static analysis result for SHA-256 7862610c0779c475…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 05:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b7e5d81625d7614c0734f345ea2470e SHA-1: c60f2609ed7978544306222791435137de63b6c9 SHA-256: 7862610c0779c47509bbe2060d64680e0c59cabff7b0e292ea760c7872bd0fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=gta+san+andreas+android+download+highly+compressed PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a01eeb17---76747989019.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/beferosipuxafotovururi.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/jewamakabeximuluguwasu.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/siluzaz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4567c1cd---18151649199.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/17143028620.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/73957584300.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/vibubusedimeva.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c9fd839b---garuzibibo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/28881886175.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dugakiwipiwemejox.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/74863771968.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/lowafap.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/89580743289.pdfIn PDF document text
    • http://landpas.pl/upload/file/23076315416.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219161048473008.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/11381376476.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/90600844950.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikutelilumewixuwuk.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614207c8a6356---28960162253.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/63175397825.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39290054194.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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 15716 bytes
SHA-256: 6c4d9443331a4e55591acf3b925556e0deecb2ab9234139f639722ed3728f349
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 11200 bytes
SHA-256: 989ee2c7c58e83e96a7daf0cc7d40d6f0ce80ca612859621942c1e6d905ada20
font_02_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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