Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a0ce5ef5d87f8f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 00:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1145e5e923fab4703de096d19058e53 SHA-1: 998d21d93fb7e1317505ae964c6ad7c217d5dd48 SHA-256: 58a0ce5ef5d87f8f3b9fa8cc1fb75a7e5d897172b2ec487624e3f46361f0073e
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of these links suggests an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4c053546d000f20f13d7fec0b9f20035/81677336467.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a352553642c---85237450558.pdf
    • https://alutat.com/data/file/10772343604.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c36aba61d54---kosovipafinavosoxalonu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5463a7f8e---59498615344.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a774305329c---79821399571.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d8c5252e317540d595925af3b1929abe/nuxakokodoseketozegoxu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cba7f7e1ab1af4484e97d5c1d16a86a9/11859991500.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/losewodezibulipik.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/71462952412.pdf
    • http://polishingmarblefloor.it/userfiles/files/78832171992.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbc18d84f---54198598872.pdf
    • http://cioccolatogallucci.it/userfiles/file/junetirizodefovu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6a35c468---nagufujabefavu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bd588255---guzebaboserimisuvem.pdf
    • http://delshadian.com/public/userfiles/file/pidixiwulejepurusunadine.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/wezosadewokososiwakuvu.pdf
    • https://alshamiltrading.com/alshamilfiles/file/30587645511.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/447ef667aff4c95d1cdb968344a9e42e/3725089653.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d06825d7f91fc07643bbd84a954f9d5a/17680010241.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d80c8222f19f412fc7c6550055464041/patupa.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/52m38onb0dulcbtnq5gm6ccrl2/92064016221.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/41932175857.pdf
    • http://palyavalaszto.hu/teszt/upload/file/litezuz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+to+perk+coffee+on+stove
    • 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_off0000e911.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16792 bytes
font_01_sfnt_off00010128.bin
240f90cf6177d6642eaca571ceea6fead08474ef0acdc13f16178b9c6773634a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10636 bytes
font_02_sfnt_off000119b2.bin
95bef527aecae8ec28ac5d82375705d7936f254743987ca5e4a20457f3be5def
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 16716 bytes