Malicious PDF — malware analysis report

Static analysis result for SHA-256 d817c5b098164816…

MALICIOUS

PDF

86.7 KB Created: 2021-08-25 05:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3341dc007930b7b117c4c641cb63e717 SHA-1: 492cf9959860b8e001f92bab2826fe6b41c42e06 SHA-256: d817c5b09816481634279155719ceee4cbaa7a859fe4152de0b5a0dcbd80c8c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

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://catamma.ru/uplcv?utm_term=name+two+pairs+of+adjacent+angles+and+two+pairs+of+vertical+angles+in+the+figure PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/drp81skkj70jji17iqpgp6scp7/tifuberijaladusekow.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/93990875785.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/28nfjs80o84bnfpdim30q4pvkj/zeguz.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ce1b3e00---86063088301.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/r97720q0vfr6v4qgnhibpotlk4/kexezegiz.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/62298292787.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/605ebb551914fc550d72aac33ce8afd5/jalixopesuzulaxutose.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/11477814862.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210601162253160580.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/21485929029.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/60339247081.pdfIn PDF document text
    • http://inistor.com/ufiles/files/74376854069.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/22864074221.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xumudunegegaxizukaxe.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/79488930678.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4df33c71---rapef.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/17571365542.pdfIn PDF document text
    • https://stormester.no/files/file/suboju.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/gapapafavupuvez.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/7651362829.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b750675b11---54033465061.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jasekitovuf.pdfIn PDF document text
    • https://cooperspick.com/files/35387334389.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5352023c6f---53765876340.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/76311332497.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4a3bf020---58865399389.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 16720 bytes
SHA-256: 34b80857f88e2c2ba04fa94a1534a6953274d6e18686d384b7273fb6cc50de32
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 11424 bytes
SHA-256: 3b046e0959a50923c9571ff4dbc142f8db79d4b4784d961c54df24c0ea330544
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7

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