Malicious PDF — malware analysis report

Static analysis result for SHA-256 667f88574255a5d8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 05:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14b35022101f975ef412c3b5540191f6 SHA-1: 6ce8c6f9b4301517986eb04e71c6539d17a2a507 SHA-256: 667f88574255a5d8cacd18937dacc3d693669187f3a6364dfc0e927af69eb207
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=convert+mp4+to+android+format PDF link annotation
    • https://uangraja.com/contents/files/99658359244.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/firoz.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/13814929666.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/meduwozojigimov.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xikujuwotawarasuvavita.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/wagedaradebu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2b39b88b---zowojuvesezesezeked.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/40533978447.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133acc98b934---sirorowevoso.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xosafelirurexozaneloxo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/92c7f145265f74b2a811f2c7594ff71b/34615956807.pdfIn PDF document text
    • http://friulanapanini.com/images/file/18211158940.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8s8re1bbhsj1o9aggp0u89qfm3/65533221575.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2918f900ec8cd117771d4fa83afa2065/27581157240.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/98513436198.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/gegobeboze.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/41975294097.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/18/faraniponudenumoxeb.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75e87f4b9---kijuwetudeliwanojakaj.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/81561121996.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/82980729897.pdfIn PDF document text
    • http://ilkemymm.com/image/files/subujagagik.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/zidafezavezemivebokokurik.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_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 10620 bytes
SHA-256: 781f1f13328beddb20631bff09d8febac413cbe39fb3829c465a4570e5554598
font_01_sfnt_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 17916 bytes
SHA-256: 11f6c05c3ee952ab7d9e2e8b5ad68cdc3b9e47ba5a32d31744620d07aa31e060

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