Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0da2455d2205ba…

MALICIOUS

PDF

79.8 KB Created: 2021-08-29 11:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67d5f0f75c94bc2016c5d544fa0dfe4c SHA-1: bad5036614f385403d321569011321c3ce3a19f7 SHA-256: 8c0da2455d2205ba6f2cf2b1ca4512e39985b464f45f6f36bd309a51058a6750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=college+of+the+holy+cross PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/24212074118.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kodar.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kasasidazemu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608833f8cd24b---65590333817.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/35576871156.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ac047429cd0df38982b67303c166138c/79470127082.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb73c4851c---seligixi.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/guwoberubewixewiwaf.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87dde96db0---pogowawobobilenanisag.pdfIn PDF document text
    • http://cy2hand.com/userfiles/96340092303.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fbf89b5d---julakiliwosapovamorep.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e235f6e6bb---37609028111.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/terajado.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/23081098565.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/forulewadelakorimazaki.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/sajixepifopekax.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/2684342749.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/pujesekakaxagilax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1c007adfec4e4c940df76bece65d310b/xiguzexisukiponogas.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/81057538225.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/javemeram.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n0g8m7ch4qs77st2g7iv997bcu/mumalopovepalolorum.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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 17368 bytes
SHA-256: ef2819b306227f5eb7cd1ba9012ba4516c4d8d31cdea8fdcced1d1261c06c54e
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10404 bytes
SHA-256: 91c53415792e763d7668c2fd4a01f61b37f14692343d9a8336783eaed4099f6e
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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