Malicious PDF — malware analysis report

Static analysis result for SHA-256 0834f3a77f8c50f7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 17:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c94111d443be19c7fb2ad60199371d2b SHA-1: f48e7abafd2662a64e7babade6f46253b076fa3f SHA-256: 0834f3a77f8c50f738d7034ff1035caa04f99501dea20a628d0cc26a62f663c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or further malware. The presence of link farms and the use of compromised CMS uploads suggest an attempt to leverage SEO or exploit vulnerabilities in website infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://arcadia-fitness.es/userfiles/file/zomupojixojupazijavijekod.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611404ef8a03e---badopumotaxijufuluga.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f990195211481d3e8546e8c6241ec688/38172127188.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ad9730e73c---52033575621.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wufiradegasa.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8841a8979a9c010ba295dfaf42e53c3/suzudavab.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31cf53da1---xetewevojovuzumejelukorod.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/tameze.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/jafaduweginudise.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b372c677b36---71959811339.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d98f2abc---warusinu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c391b6f5---vekowedobuzajepepas.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/17270997848.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d8a3041ac70910d3aa864235d0fa90d2/24620323939.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/gukafazapomebe.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/32411873767.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gqivn8hb71k56bmvqf88739256/58976108796.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/lerabuvobotuminexezivojat.pdfIn PDF document text
    • http://freetds.net/userfiles/file/patujomoxozefuxuvatepotej.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/paxuxa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a438f747---nopixulur.pdfIn PDF document text
    • https://tl-systems.hu/files/files/89119048565.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/72ee77e8b9930ae4ebe144292fdcf2fa/xesuzexuxakibobekuk.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/temubamisoz.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089a00cd7302---wutajikipivupelulev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tratamiento+de+epilepsia+en+ni%C3%B1os+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_off0000c22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 18544 bytes
SHA-256: 577f2f44248a7b1299e8a9888e4622ee3bba75f86c2b46047dd51a4ef6867a81
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 10828 bytes
SHA-256: 3313ac242d63929c912338c404db07e17f9d07d67771816a99eab034483eaacc
font_02_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1