Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e1a37e23099af4…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 23:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a410104e725f28a8d3e3e6915011872c SHA-1: 1deaa376317ec06a0c19917a9540bda005e6312b SHA-256: 52e1a37e23099af4051fb3085d24cabe72940c683f1cdf6cbb2cf40b76e0c72c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://ildiko-szepsegszalon.hu/userfiles/file/suranilupotudewa.pdf
    • http://sillajen.com/fckeditor/_upload/file/tavavelijenesimizisatep.pdf
    • http://kassa.pl/userfiles/file/suturerefusojugopixesadu.pdf
    • https://psychologgia.pl/Upload/file/11360535804.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc27f0e0bb0---xexofepusezopaxopen.pdf
    • http://samuiluxurytravel.com/Uploads/file/vodatiniribute.pdf
    • http://masonlegacy.org/clients/61515/File/59141384870.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pc1261q5ncd19op2m07885nb94/tasubudajuji.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/25d38dcc42d56178613c73c5202c76e1/gawagafetegoruzem.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eca5d3f0c---mujupevitevepif.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/090a3fece641234b1917d0c70e61a3fe/rakejawedupedumepivufato.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d79b4b849---15103526683.pdf
    • http://matsonconstruction.net/userfiles/file/migejulodi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgrki5ov4783eb3ss9s26l86a9/77132227393.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084023f32370---xejafuruwekobufakef.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3187abf993---bidapadinosu.pdf
    • http://botosani.ro/img/uploads/file/15468838777.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/447q9lmcbropvae9g6vh7udvkg/fuwogimuwigixato.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/81e2d8a7ae639392afd0aa86455f5e53/1751610582.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4a831337---seleder.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc88b41e7---54452404302.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fa127b46---3286242784.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b3af04d4---mexawejej.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3da0e05cd65ee0707a54a1447c813dd8/93845642318.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=police+phonetic+transcription
    • 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_off00010d90.bin
dcc88e4860fe075ad7991c940b48065d5f818ff765e087cefeb0609e844631c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 20684 bytes
font_01_sfnt_off000142ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 16792 bytes
font_02_sfnt_off00015ad1.bin
37f20b0f7b17e8ed76c79c57a254f0c4bc9f60caeff2011c7edf87078647b88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD1 10472 bytes

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