Malicious PDF — malware analysis report

Static analysis result for SHA-256 061434268b0b5add…

MALICIOUS

PDF

95.3 KB Created: 2021-09-20 13:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b012dd15b45f5ae856d16a57b3e5255 SHA-1: cdbadc69607ad5a2405c5f23ec68e70b3c9db196 SHA-256: 061434268b0b5add5901c96329d88e39db4d539463503b1e70923e297085129b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these redirect chains. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://7166867.ru/ckfinder/userfiles/files/44796527735.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/xekufatufofov.pdf
    • http://epoch-making.jp/js/upload/files/xosegadiwenozumotimevixe.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/13614731176.pdf
    • http://dongkoo.com/uploads/editor/files/bibebifodevubosobixe.pdf
    • http://lighthouse-connection.at/myPix/file/bozunarubowobunekej.pdf
    • http://betonkeritesek.eu/Content/files/87942483840.pdf
    • http://local-minicab.com/survey/userfiles/files/47613031421.pdf
    • http://camelliafb.com/uploads/files/202109010549358110.pdf
    • https://ruta.hu/ckfinder/userfiles/files/favixosixedo.pdf
    • https://motty-etai-sharon.com/files/files/35361194234.pdf
    • http://skomi.ru/img/files/file/bagonirajuwinukebokajejaz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vhqs0q2bbjgbejmnr0lam8ajk3/73753411535.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143222a327ea---30641346241.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/79122240332.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/95435123200.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133421a8c73f---23943111012.pdf
    • http://beccaro.it/userfiles/files/madawelinigofudetex.pdf
    • http://www.findvoters.com/userfiles/file/tidupekalasipopoxenab.pdf
    • http://lifebeachvilla.com/uploads/image/files/porajorikezi.pdf
    • http://dryoucosmeceutical.com/userfiles/files/pugamemovusen.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/82836339690.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+scrolling+platformer+scratch
    • 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_off000101b1.bin
0b649126ad743b5911ecd752bc3b12e38616ce84d8baf2bf22f99e63a4526ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 11096 bytes
font_01_sfnt_off00011b63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
font_02_sfnt_off00013375.bin
f2c8f6707e7cfe9563921a6ff713d7ba774083c4b5236580ad66c46111899679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 22632 bytes

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