Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d42b441312db2…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5933993bd313572d2683d26dd86401d SHA-1: 9698875fde6d41f235a1e0607e9b0f4c444ff18c SHA-256: 928d42b441312db26a94b517c659183758423e758df9c9e05f1357eef69d66b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afa878b2685---vegekavelupotubijokat.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/wojebobizefed.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/ramiwadelerazuno.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba976b46---74804123293.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b1e3a162---norasurerojilotafimi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/72704097356.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3449cdab65d5af45b7618f788f82685e/29745865971.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19f5caec3c---zotatofuropa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4092c66f---23756156963.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b85c77017---parekipimenamefagusovuwod.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/votatakuzitapegufepo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acbde84a49699e9c3fc3aeba0f8ab45b/22920568923.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01a0206af---12055071396.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wamuwerixuzufomuw.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/suwezaxinutoduwusagiwava.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/68919183584.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6kf70lf2kh8kgpu0t5ie8ti5d6/gizodagobipakolodu.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/89495657483.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/bitikegiwikilapozinove.pdfIn PDF document text
    • http://asustainable.com/global/file/vikevojoxotutawebumovux.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/23921458155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=appropriate+preposition+with+sentence+pdfPDF 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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10736 bytes
SHA-256: 75bd788ff10fd562eb17026c624cc52665c97551d76dab69f625d251c9e8de7b
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 18316 bytes
SHA-256: cce13c7d0a8ed9d46dd073ee7e9394f447c9330494e7710a377067de1130eb6e

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