Malicious PDF — malware analysis report

Static analysis result for SHA-256 0879d3df46a335fb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 14:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a450bea8866afda7d449bbf42f1f1683 SHA-1: 3507af06542b4deaa8dcc1a402d5dae702e07980 SHA-256: 0879d3df46a335fb9b6a440b8fc246da4978c653de9235d62ee29b63589aa08c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://srtprogetti.eu/userfiles/files/falogajogikoxubufidoguto.pdf
    • http://accessprecision.com/userfiles/file/66004722310.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/64a958c053ff44b6d5d6055847013817/bikuz.pdf
    • https://kakakmanis.com/contents/files/setev.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/59088182514.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/39604999846.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_131029.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132445bb686b---jovasejekujaxazus.pdf
    • http://flexinform.com/hirlevel/file/33258149069.pdf
    • http://studiolegalezullo.eu/userfiles/files/kumiwegeripesikumidu.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/daxudiwev.pdf
    • http://manisafar.com/basefile/marcosafarir/files/mazezofegafavibukel.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8847592b---45945049656.pdf
    • http://interiorconsignments.com/media/file/94184488279.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/bogakukufoninokalemimeb.pdf
    • https://bwhe.in/ckfinder/userfiles/files/povegikujuxijogi.pdf
    • http://truhlarstvi-strakonice.cz/files/file/76068142927.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e393a1164c---43881053158.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fba551b87---rulogoxeka.pdf
    • http://jfhconsultancy.nl/userfiles/files/62624230753.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jugod.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/30601599477.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfd45842d---vetorifo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=to+what+extent+in+a+sentence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin
f1957ff847b5b21307d00aaba18e3192519abc4b264389395342a2e7a2be105e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 10332 bytes
font_01_sfnt_off0000f0d4.bin
1c0efaa7b2331f385ae6b8c43c5a65d0b2c926d29ed8a00c502638b1da10ab64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 17496 bytes
font_02_sfnt_off00011ee6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes