Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a5d31c8ab88b52…

MALICIOUS

PDF

78.7 KB Created: 2021-07-02 17:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25157fcf6bbf51b42e469b60442c36c0 SHA-1: 0a16dc5bfc0d113db2bdbdbaf8dd3cfbd59b6257 SHA-256: f9a5d31c8ab88b5257168fd9938c18cc629f90f65e00f10c8792df47469b7fbe
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to potentially malicious destinations. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=electronic+hand+book
    • http://zrdb-drogbud.pl/Upload/file/gobukikumaseg.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1882e5b0c---tagadimitaxakefupakemu.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/56cc7442d832ec8d6f4911bf35ab29dd/48280699663.pdf
    • http://asbufestival.com/uploads/FCK_files/file/67116623362.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2f0c3577---xomaluwaguna.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1cb76243d---83773279834.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b40513db---97886744330.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/838dddb5e8f3ee30d59a428d51b91ffd/watomowisiwiko.pdf
    • http://seanmore.com/userData/board/file/59248730190.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sjhp1fofac8fr0qmrf60r322f0/58002831465.pdf
    • http://hitecds.com/userfiles/file/gopitutakovuwefigi.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a886d13d2ae---26739308887.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf222c706---zanitap.pdf
    • http://bajcsidavidfoto.com/_user/file/54282712225.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc030aabfa---89497538578.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8b077bab1f2951ce15d47187be4f21d0/nedodawu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7h42dev4hb1jek7th3dann4sf7/wojajakalalumoxikuwar.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cbd8e7d161697b188f3bc50494494a0d/57298667508.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/boq3kpbbrql0ik2gki7usj0n13/vejizaregapilavipib.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/601ab3db083556d8e1ec7387f17e2096/16516937221.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3919c7e7---58833494265.pdf
    • https://usssecuritate.ro/userfiles/file/fupevubisuwoze.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/buvapaxazotisijilujaxizo.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e449aae4fc---xokofubopopulegaxida.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/56048e7e8488641f37d93c3352552d97/42301220339.pdf
    • http://dailymaydemtien.com/userfiles/files/50907148759.pdf
    • https://yuss.it/file/60841500022.pdf
    • 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_off0000d15f.bin
0548b9ac73382db199d4e2f8047befa95d1dfe5ef8b8bbed8a3c1150cb3102fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 17172 bytes
font_01_sfnt_off0000fdc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
font_02_sfnt_off000115d9.bin
d254b83613d60a10a2e3b07c608551af28ae5d7c6ccdbcd83b212d81463d601b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 10516 bytes

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