Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f121460ce96b566…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 23:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b5d83cde850a78282c700146e1cd7cc SHA-1: 6ae9cbd1bb44db08fbffb443449fa759cf5deebe SHA-256: 7f121460ce96b566c11c758b79a302de7b639c3448cc46820ce2c3ea713832e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697fcaadcc---91781656914.pdf In PDF document text
    • http://jucal.es/images/file/jetitubaresadolu.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/9141056790.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/mubirobivowagume.pdfIn PDF document text
    • http://newo.ru/files/files/kigovotovutiluferesuj.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/masibadasuwedazemo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6f21b35d---tatudujas.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/80112781350.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/45073576326.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/27970062897.pdfIn PDF document text
    • http://brukbet.com/user_images/file/fitebipujimexuxunagi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lawazetenudabil.pdfIn PDF document text
    • https://vleek.com/uploads/files/tagagomewixajawaxaniku.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/wizaduruzemarebafatel.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109110727233884.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nunenisepivumasikasezaz.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/91713260510.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a0c3dfd0d44e13c8f191190ec7831095/90114315932.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/49529443111.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fazupagesesebosew.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/muvoxemefomupaxu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/ditevida.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/suzuloganivoxabamekozovin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pixel+2+weather+widget+missingPDF 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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 18444 bytes
SHA-256: f83becc9218b5673d6541b65cdc936bbca28c6365a84137b3afddf32303ed14a
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10884 bytes
SHA-256: 3b2aaa90ca43f0e97e2e740831d229f4eb7c78d5deea10ccc6ea9980e8cc205e
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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