Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8527bfe6ce26f7c…

MALICIOUS

PDF

100.2 KB Created: 2021-07-13 04:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 61477da2aff16a13c079fbfa1e31c651 SHA-1: d68c9f42d4cdbd20d6d0daf1d5dd19670c5b8bb4 SHA-256: a8527bfe6ce26f7cd3f1081b5b521f37b4aa81c64cb961e10fbde36fcbf01d00
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://archism.ru/uplcv?utm_term=ping+pong+3+arbeitsbuch+answers PDF link annotation
    • http://absigorta.come/file/bopoleniwe.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7eebffb3---90741719002.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/35375919973.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f648cb7da5---1490491149.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/84628705151.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f4f51f17---29880820213.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/watogitizukinarebuzamu.pdfIn PDF document text
    • https://peterdegendt.be/file/mijetovuzonekuvopidogafo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2566a02e---73937977301.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6954953c06c91950791173dafc10ba2f/memafelowipawude.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/09d5acc3ca6a5c623ad69a92da01468c/82779337069.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zovozutopoxoxojo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5346fd65---jubiruzupuri.pdfIn PDF document text
    • https://superpart.com/files/32402460041.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/93152486125.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/skdugfoflv2sn99p2t1rqnoh67/77587271049.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160978c9052f59---bimisokunosekebifukoje.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d838cdea5697d0f3544d26e5c5443153/72780097660.pdfIn PDF document text
    • http://iphysiology.ru/upload/83227174529.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j3m205brois4sfv426bqpev7oo/nuvanezuwufos.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/gegaselujanigo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe56fbed30---vezonutotogezitazakax.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4mufl8kttf489l0c8ncv37s7h6/36372402670.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_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 21904 bytes
SHA-256: 3b58c0326cc7241e0fd2be8ed1f350f27129ca99c63118341a23444a90199167
font_01_sfnt_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BF 11104 bytes
SHA-256: 43f5d11ce5a2895d7014c589088d9eb0016a36f3743573aea70d4272b7d1a85d

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