Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d361508e64d0ef…

MALICIOUS

PDF

132.7 KB Created: 2021-07-03 03:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adb6d632b8fb7eca7260f58121f83109 SHA-1: e68f7143766d5169fb7a1e912a7dfd6bac3c6b35 SHA-256: 08d361508e64d0ef97cab2f42fdc07ffbcc4399d5621fcf89e89c1eb57c4dbd2
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of a callback lure heuristic also indicates a potential for social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/jh8fgkbtvasjb0j8m0p8usobn6/17822129005.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kefil15suhl2spk9k2ff5hc592/bozanomun.pdf
    • http://simonhoirup.dk/userfiles/file/80807057319.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jssh1ufe2q6eqhcbbo64migil1/48673183749.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5i5f0ge16f5n9itlku5hrnpj16/luzilamixiforofuvage.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc56cac368---ratoronavotopupiponazit.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607569c0134f6---jotatijirib.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b317b537453---kewuboriba.pdf
    • http://cosmic-kino.ru/sadm_files/lisefudajugisukegu.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sgk3g67garojc15vn57qrnmh05/28236985883.pdf
    • https://irrisyst.eu/files/file/77947667894.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/762d91753d49540416bc0eff2e05d98e/petunel.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6d9e528b877adeef0e6198c0040d1677/bevake.pdf
    • http://ipsgroupjjn.org/userfiles/file/29676984147.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c4v5g7uba9eflubmr43shhvb51/36191453344.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b3e31c4acd---wuzoruses.pdf
    • https://businesslife.com/content/file/batefububetupiroweg.pdf
    • http://inezorviskids.com/clients/37546/File/99708097732.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea265177e---mawesakovawikolikaxe.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb994264c---88827389120.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe7f81b89---sozijuvikoduj.pdf
    • https://people11people.gr/uploads/File/fefizevatisigojirumezamiz.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098352bbfc22---7380030041.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d91e7b240ce---58840621167.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/79125571635.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ea209939a7805a43d0cbbaa597a844d/65337026097.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=st+clements+street
    • 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_off0001a398.bin
5b70a876d78ee27b4ce783284195dc903592644084e86e7a7f3bbbf020f616d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A398 19288 bytes
font_01_sfnt_off0001d6a7.bin
490f6622aedaa05930ff2e32290326a76482f82d397563742c747efb563bd94b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A7 10092 bytes
font_02_sfnt_off0001ed14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED14 16792 bytes

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