Malicious PDF — malware analysis report

Static analysis result for SHA-256 936826f774112697…

MALICIOUS

PDF

84.0 KB Created: 2021-10-10 22:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80867ca7d7fa2c2905bbebf7721f6a09 SHA-1: 5fc53173de470cc067d0982fb30ad7a62130e598 SHA-256: 936826f774112697f1004296c8fce5a33d307f3048acfb61da4f8b0ee565a699
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to distribute malware or phish credentials through a network of seemingly unrelated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kanat.com/upload/ckfinder/files/binavexuzavivawerereli.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/664fc8c36f8bb6e1922cf213ce7b6954/bosatek.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/limavaz.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/70715377929.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/97725456234.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/80559658348.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/kakezumuparo.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/30248278660.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/34972983976.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/dozafejen.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/33231270307.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/75832161716.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78901693188.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/nosatawevakuwugexo.pdfIn PDF document text
    • http://sbairs.com/datas/files/53453629164.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/zevixazegufalugabu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/xupedalofasadovisaw.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/5136544088.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/41910868305.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/bixavabigofaxarilatitebal.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxin.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9cdafae6477398088daf925543c1af74/85816773414.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615631ad3ef2f---71849980186.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/tusameruwe.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/sonepisura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+sun+made+of+how+do+we+know+thisPDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10744 bytes
SHA-256: f993b490b1592d8bf4ca6fb91ea71500b61581084111d565e17ccb90e5659ac7
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 19736 bytes
SHA-256: 30a7017ac5b125e1a958bec59a3cd10f24e358f9976246ea53faae2659b69c46