Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb224209667acd7a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 14:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 477888afbf755ca88f0339df651a13c5 SHA-1: d30b37183f70d07f5fefd0bd1ceb717691a5f3c4 SHA-256: fb224209667acd7a6b7ac3ff6f7a867b1fc5d8c65f4609b7d8c9168745838884
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. Although no executable scripts were extracted, the presence of numerous embedded URLs, some pointing to compromised websites, suggests an attempt to redirect the user to malicious content or phishing sites. The primary attack pattern identified is a callback phishing lure, aiming to deceive users into contacting threat actors under the guise of a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hanabi-la.com/uploads/files/padukupekuw.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3f5e9d58ac27f041bb05087b1ca1012d/wimuvowafulu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/kiged.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/vodonizigotakip.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/bumelijodokaloto.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kidewizufewix.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/rujufevemiretemapamafiz.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2e88c6e1e155729b297f43d40ed7532/36179049234.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/92961356412.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510e7bcb03---40157711411.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/josajasef.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/10495571034.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/81647535145.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/55893828870.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/44077444740.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/44112217858.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/nakadapowixex.pdfIn PDF document text
    • http://linker-apps.com/files/67758147119.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/17895765759.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/lunosajefakuva.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/wuletowijo.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/14026757837.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/47886167314.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vanokipekapimakunowido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=surfing+with+the+alien+guitar+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_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 10748 bytes
SHA-256: e55b3ccd2edd52ded9ec5fc191bc5e8165abe4369249c6a45bd724bbe854d97a
font_02_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 18620 bytes
SHA-256: 12e17ed2b2894dde1a31f22be82c45e5b4d316c5a1eb169f5fc6a15bc48a8730

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