Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a86d6a346539b8f…

MALICIOUS

PDF

82.2 KB Created: 2021-07-05 13:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ee58631d5770920ac8a70b0739668834 SHA-1: ad5f6b74f00755220d53feaa7b27415036ceeb75 SHA-256: 7a86d6a346539b8fc81e4296d07e7b787a712c361152b7b8ec6de6a826bfbeb0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting a distribution mechanism for phishing or malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://riskhedgetech.com/uploaded/file/9280828696094c360d1468.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609980969fd56---gibesebufekum.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/kusajutobafiruse.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc3617893---95932737135.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/16707796624.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/25285828989.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a9580869---18388774376.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/255451010601ada7680603bccb4066c1/vubowelukaximeja.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/vokaxaxuzekorekizokiveraw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/821c56b3235b11ba476d563cf51e23de/monirusabizoluduzi.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/97788440279.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jezabetadidilulevibajiliz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028b0d753a---75786605490.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1d2a4d5d0f64503bddd5b9c84b531dbf/69426309296.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/nuwisowavilufagugane.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5de9bf6e4---beritetotamolavowusakanun.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e3fbf762774d3cffafa3ba0a29a0cb6d/nekijab.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/jatiluzasigun.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/785721877.pdfIn PDF document text
    • http://keacg.com/upload/files/religojivob.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/69474291554.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f574b861---87528269950.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce7845148---21516766960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mass+flow+rate+si+unitsPDF 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_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10384 bytes
SHA-256: 87892a24fd22009f9afd5fda5cc03009f57f9b63dd78e0dba5b5bd6cfe9d822c
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 18352 bytes
SHA-256: 379f5c7f3b95b29c2114ed379e0c7b1dc297de899b1ed54046c9c6211cf372de
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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