Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5416857277bc7f3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 19:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7aaa5413ca6d7f1f0e744430f1682eb1 SHA-1: 07581b81337067363e92394a258ae6834fb8ff4c SHA-256: b5416857277bc7f3ac6c2fb08e37a3b0955ae0f21ba71db55ac8bbdf905ed2e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

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://danies.ru/ckfinder/userfiles/files/42768436520.pdf In PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rojawedol.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/79473839834.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/roxibelikulebowibesox.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/topufutilesajukoxixaf.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/37067030945.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/60664588968.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149573da8daf---84428088893.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/55606995a27fbda167d140302da5fa2c/31589418686.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/94561675705.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/907e32c545d9e05db87a8a4439263b42/29368168002.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/nevijire.pdfIn PDF document text
    • https://hgb.se/filer/file/jigusa.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2poa1f564j1d69n2sbcl2jpjud/jirumefinopevofolamu.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/51995163056.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/16486519126.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/refukeponezalekodi.pdfIn PDF document text
    • https://viceda.com/userfiles/file/40856437874.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/rabukepetepoluregewiku.pdfIn PDF document text
    • http://schokofontaene.de/idata/21615659310.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614661488f1b4---davaripub.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/jekovama.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c437d91908---bepuzoketowesafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jack+reacher+never+go+back+streaming+gratuitPDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 17480 bytes
SHA-256: fed97523249ff451501d00e872632ba43fe0e923f168fcaae8d8b561b8907a2f
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 11020 bytes
SHA-256: d39c191d5381862366655c4d7df2974bd554db26c00a91afe0197b52f44e7808
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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