Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a3e7213261c6ef…

MALICIOUS

PDF

77.3 KB Created: 2021-06-29 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faef340aa30c129fb27c3bff3e87e987 SHA-1: 5de37fef48ac6afaa30fdd9cd63bb06eab23bdd1 SHA-256: 91a3e7213261c6efbeae54de5d6717b3c27383b3b5f1f367f88add391849dd16
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links suggests an attempt to obscure the ultimate destination or to increase the chances of a successful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://rauvuonsach.com/images/uploads/files/68476001647.pdf
    • http://assushop.com/userfiles/assushop.com/file/52402289394.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/de9f0f4c18ef7873086f5e01a53336c7/pazazajajelugofeto.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dc4b3f1e---6730213973.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/km6eeh9gn9vr3s5fb30cdvje6l/boxijelunovajawemoruwo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ca801e04---bajaped.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0ba894f3---befolilefezowudigi.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ctbjiipp13k90c60beiic12dmm/latijiwebex.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r438ui4081mtst2ood95rjnhgg/91399149537.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc45dfb33---zenirozilebupuzekinu.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d8d65639f480b2b6dea1dd284f421f58/pisafis.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9b27da16---lawidobuvabukaw.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5bcfa86cf8e9c06cd598ce0b4591da7d/26549367931.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfdd827fc---53866802014.pdf
    • http://abwmarlboropike.com/uploads/files/51795611986.pdf
    • http://4seasonstours.in/userfiles/file/3088252321.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb608316e---14364297223.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a92dc670---jomoguzirip.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d649c623390---54451148580.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ea0417c2---61512772777.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e08ff9af9435d93ec74e3ffb5af7e3bf/fixenaremugamu.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/u6fhlt9irk5ru89gq5290ho767/86922498873.pdf
    • http://naoshima-habitant.com/putakilunaxanilavatar.pdf
    • http://esoftland.com/userfiles/file/bulizu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=top+paying+finance+jobs
    • 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_off0000cb3d.bin
9ec4db734698296c236babcd75c5c218676c3872dfa30bfb74f61083fa9632be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 16544 bytes
font_01_sfnt_off0000f5fb.bin
2eee89a20188311f45f8cece2eca3e5f24aedda4d66573bb4b45619e4951a62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10760 bytes
font_02_sfnt_off00010eab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 16792 bytes

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