Malicious PDF — malware analysis report

Static analysis result for SHA-256 687416e32acd526b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-04 11:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9a81330ca9673b793f3773f380266492 SHA-1: 10c99218bbcd9692ba1ee163b4cee338fee5d1af SHA-256: 687416e32acd526b16e01da0a0cfb59eb9dec192ab2207b57b75286e97323267
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6c073f20---juzavegolimuledojo.pdf In PDF document text
    • http://ibb-online.ru/f/file/52111362173.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4c925a51---xukox.pdfIn PDF document text
    • http://4bx.pl/public/file/tazajupamosasawi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609857831629d---zitojo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2s00k34qagifom3cd475jg7j2b/64195904317.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e5281ffd9f5ddde8f5485544c77f638c/76141172009.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/59347881038.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/47119413334.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3914891745c4102d860a5b1eba9fa97e/43068118976.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nedirafavuporepuwinodivuv.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/39602930457.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tukigolojujer.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/g9mjagn6kbj7evv7pfigijp106/boboju.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/xojeluxizet.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3f2faa672de4e5b5497679666ce16fc2/89135695460.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf072f584---18022969622.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210624_102425.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/96765271165.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k7jkeosscks75h9uj5efpl9q8e/17070089166.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nezeritatubiz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f39d75690---60816150921.pdfIn PDF document text
    • http://planetamama.ru/files/file/rowukojotaw.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c147473791399045d2defe83b43073cc/wigipup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=solutions+of+sample+paper+2021+class+10+sciencePDF 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_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 11112 bytes
SHA-256: 937bf86a4cf8250a218e06cf01238c507828586874362cbfaebcb1c4acaf9fb2
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16084 bytes
SHA-256: 800746a97eac636f043a34d9c167e99c06108659778fc0ca16eefe08f97721e0
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1