Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c04f2d26af93b4e…

MALICIOUS

PDF

93.0 KB Created: 2021-09-03 08:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39af27375409a865b9fa982e418a82ea SHA-1: 91f08cf597be0392b4e753835878533b7c564c32 SHA-256: 8c04f2d26af93b4e9195f6a1c0cd9a503bf1d42b2f5e4c28e7fd1d196b6da29d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link farms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://intelekt.biz/uploads/pages/files/mujumodezomupig.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8cc66cbd---83320793298.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/95340536134.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/13341646273.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/77055049445.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/vifilopupu.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/sujirexorufiwume.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10695860705.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zogogiforisudetufa.pdfIn PDF document text
    • https://grandstone-egypt.com/userfiles/file/dojexo.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nosajizebuvanupelas.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/1t01264cn0896d4o29t55ekfua/90050027822.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/benoxefiwepigesi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/efn02v96s89vvnh5ktppuhank0/mesikamezeletuteb.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9cc5f0386641eb3da4c42c1e54e1fcd9/zotemef.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/6477229322.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ed2066c15cfb3fb36ce89d81abfc785a/55196421902.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/wukaviwukaves.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ecac58a820bec70a81346084996965c0/14908970837.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d25a737---58947074585.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/56456086819.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8266cb1999---mojol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=philippine+passport+application+form+download+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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10972 bytes
SHA-256: 234ebeecf1cf5e36298f2c60acd9d502d2f8a48654a468cdb7d56c587c0c9533
font_01_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 18512 bytes
SHA-256: 6fa927b80181be9a83da5899e36eae108c16b507b365ac975ee17484b4f432e0

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