Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0acd785040f16a5…

MALICIOUS

PDF

81.9 KB Created: 2021-08-27 18:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df0346650eefb0db473e5ea7b764ccdd SHA-1: 00192f37be1b47623435b8000a7ade9d3fe3c02f SHA-256: c0acd785040f16a5d1f878debada9c38d87d9040349da1aa79307ecaa3474971
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting points to a coordinated effort to obscure the final malicious destination.

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://doingthing.com/downloads/blog/geust/files/jadewisibuj.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e806b6b45---narebuzetanedin.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094eff1de6ef---bozudasuvupukuwa.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/80551432286.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f6e39a0e---54566506236.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/reworerokamenusoraluzu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38b3ecf4b039527aee26db5b32c9df2f/nikatixedofeladoga.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095baee27d33---14683735524.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94190c69b0---9130688879.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/7828168240.pdfIn PDF document text
    • https://linker.tw/files/9480055459.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/kazapaxono.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/pisupududalaxi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/kegabosobiku.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/66571038059.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/79695328596.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/379792c221f66864576957f200ba2ce0/pidijod.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/93502245083.pdfIn PDF document text
    • https://ikansambel.com/contents//files/55600251968.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/wokema.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a587692598d---mubek.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/wevobutop.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/xodedopezenidafarujat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+the+study+of+languagePDF 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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10920 bytes
SHA-256: d10c97669cd3ff06ae79b583437c1196740f1584c34d4206db2b302061d1557a
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 18936 bytes
SHA-256: 0fc409e8d922e150dc40e114d850d53ebfabd03eea861ea496c9350fe529f649
font_02_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1