Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef52fd82459433bc…

MALICIOUS

PDF

105.4 KB Created: 2021-06-27 09:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b729fe4dde536b4bd7071c408769151f SHA-1: 232cba1805e873e69c68b9453de02e3c1c7437c9 SHA-256: ef52fd82459433bce8070fe2f696e867bd933a8cc0ff57855607c493c688d483
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=idiom+for+helping+others
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/4bdbd70140203a884032db8cb7efa5db/xofix.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/84761659450.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8je1vnajtq6pcg5hto3ot5265s/vonedenidofuxefoxoxeder.pdf
    • http://houselandia.ru/files/xadifigaze.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/17003348389.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7faf668bb4796632300f17fb063eb877/3124542043.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa79022aec---muxufuzig.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b89c97bec2ef9d79cd350bcd03b7c6ba/zegegudajenetajuvakugu.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65ab8ccbcc2c5f82f39325d41f72dc69/21270272226.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91800fb8533820565a5077a15b680040/dadevazoxuxuj.pdf
    • https://ekransamara.ru/files/85800285020.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda4df380e---52733325834.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vtjpprp5r7bvqtf91v0fjvreu0/nejalagovakabusofuxota.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8f5af24e71f3b9f73b6e806e0e004942/lukaxowad.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/61e2c93bb50ac0be3d44d9d0709e2ba3/pejesi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087585ccdabe---19018171271.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723880afebe---loxizimede.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef63868536---35499055335.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a02de956e530502e97dc2c48e1879e5/19738879620.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3075013a2358e4987c8cb07174836a/93304115347.pdf
    • https://foundryindia.org/userfiles/file/vajex.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/58cb93cf061497da320af7dc0b7fa0fc/10630411243.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/50b81b9dedb4a166aa1f12114c7620b5/zeregomakitofikovawu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a44.bin
2004c65cac59246240cee978f081f2e88fde9618d36cff68c2117f646b91629d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10732 bytes
font_01_sfnt_off00014267.bin
697d853fab1859e8c9c7bb4c9d9788d10253d237e67f04a69a6b048edc3cd606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 20008 bytes
font_02_sfnt_off00017591.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17591 16792 bytes
font_03_sfnt_off00018d9e.bin
99b496f53c926a68ebd597b4dadfbc76a638d29eca09129a6143641e2187ccc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D9E 2444 bytes

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