Malicious PDF — malware analysis report

Static analysis result for SHA-256 713b52eb3013edf0…

MALICIOUS

PDF

77.9 KB Created: 2021-08-30 01:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ed51139c5fdee739f53b4aaa318c4f SHA-1: faaba63a6b6f70e88c627fc60299565bae30b0ea SHA-256: 713b52eb3013edf0f04442f8f62ab04a0a2b7c3a1d3f598b4703d6bb76f41999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The document body is unreadable, but the presence of many external links and the specific heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://foundryindia.org/userfiles/file/timifugizo.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5a1c10f79dd2a54f31a15a3ae86d1300/44915324694.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99eb7de0c---12856420230.pdf
    • https://soalmatematik.com/userfiles/file/55833586186.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c032d2ab25---kepegubupevefobikowasuz.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f997210b1---2173914552.pdf
    • http://artgraf24.pl/userfiles/file/pibalas.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/mevaw.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/61660968357.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7f35da30---38129042665.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbd5eea92---30181259702.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/lutiwobuge.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aa06bf32d815acaa9976cae90040b2b2/79411541758.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaedfae8992---fajinujadaw.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/dukix.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758dd2849ab---renitazafowevekasarovube.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fa6ce2cf7f0d13e0efb2699d4932cc0/zotinaxoreronavixujod.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b618c3af3---51903815572.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/o72lhpfh15cc143mdcvvcoc0st/nigenuxakotarizenosawere.pdf
    • http://beadsandsupplies.com/images/file/1526818012.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/14065500c6985d45cecb0c64b9bca670/44744257580.pdf
    • https://robert-zauer.cz/userfiles/file/48848662555.pdf
    • http://saothienemb.com/uploads/images/files/rifuvebudol.pdf
    • https://foundryindia.org/userfiles/file/zenedonobepusezoka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=holiday+well+spent+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bc.bin
97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 2044 bytes
font_01_sfnt_off0000cd0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 16792 bytes
font_02_sfnt_off0000e521.bin
e5bb8d4ad93c86a8e60176f7ad24ed697c082efd46086c4cf4c9f30c86012d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 10824 bytes
font_03_sfnt_off0000fddc.bin
7574592dc992fa9e99f5b4a990b187470443e0c8d8038a7d55e616905d5ce715		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16808 bytes

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