Malicious PDF — malware analysis report

Static analysis result for SHA-256 8067f3802e0d6397…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 09:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd57065a5f165dba6fef290c5042804e SHA-1: 3243b3857f2b41ba8039761b9f065086c58f4d2b SHA-256: 8067f3802e0d6397756953976b1cd4fda941a0f5e7142613038d0cf51a1da7a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as an MFA or one-time-code harvesting lure, directing users to click on numerous links hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a credential theft or payload delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allytemp.ru/uplcv?utm_term=ap+sachivalayam+merit+list+pdf+2019 PDF link annotation
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/27123413201.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/59002182422.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/99967038983.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d83dde13c---83219589597.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2640f955---pulam.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ludelefedub.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ndg0uih3g3udm0eq3l3mj149at/wimakuv.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/jikipitikopoxofujewixow.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512103817302419.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b420ed752fd---logusilon.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/sufuwulavo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/zubofegarapo.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/mevurubasaketutebukinamiv.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/87b0235114a7c20a35375b2071600ef7/43944652315.pdfIn PDF document text
    • http://benly-carson.com/product/files/rogisedototisal.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8b8f8eda9---fasovovivelulikewar.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160efdebd18957---65563946158.pdfIn PDF document text
    • https://coluer.ir/documents/file/fatimerugetuzusawel.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a0d2fa2---xubutunosavobererubufezu.pdfIn PDF document text
    • https://telenovella-bg.com/files/titawatuwolamenozuvekufi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/b83pqdco3vv7ktg5affvco6j31/wosojin.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1b9f147eaaa3dfbab5f67b2e7415c242/72831746964.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8a9f16e0---gegotojule.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/dukudososamivatuketimef.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 11284 bytes
SHA-256: a99c1eacf387d7f735fae01faa6c40a581c9c7e1a59adb421480246f713ab9bf
font_02_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 21792 bytes
SHA-256: f9eb5d7ec334f7274d8553b1062cd91130eab6412b21f06b652a5fec6c5611b6
font_03_sfnt_off00013a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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