Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c64c7197d24b58…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 10:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a403891fc39a2b1e2cc721ade75a18f SHA-1: 1d1b0deed0151f977c296b5fdbdb902eff360947 SHA-256: 28c64c7197d24b58fc7b0f0c00a7ac99134e0fd42bb0bb07437fe80090b2f395
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which are WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to exploit users by directing them to malicious content.

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 https://wastran.ru/uplcv?utm_term=definition+of+rarefaction+in+science PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e5a5db66---robizabowedinoziruzaj.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210616_27206C4B1F8175D8.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zivuxijonunomur.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/36e849eb6cb89eaaccada9019d58da76/93521833270.pdfIn PDF document text
    • https://sinarwaja.com/account/files/17514477847.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8dc69bcc5fef761ac59c3b0de7bfdcd1/gogukefubupel.pdfIn PDF document text
    • http://dgjst.com/upfile/file/95490389694.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/17590929300.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66967eac2---vipafeva.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/13472626949.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/91906389706.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083862a2367b---dexubimorewija.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dabujunekarawofufurud.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9abed061---68729656386.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/togugofanidev.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/71a99532398b0660553eb69b19ed409b/71051530780.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4a6e99a4c8639be7f4e32846f35b97cc/33805590194.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/17864516014.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f80361742---91399596328.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/24700365320.pdfIn PDF document text
    • https://bnovum.hu/downloads/53910613409.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0m48j5b04fucjqghjjeqk5a7vr/bofoteviraguxumuf.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tt3rfj5hrp27j4atq04h1vfvj3/99666111229.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920b935b7e0---rubowoxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 17272 bytes
SHA-256: 1f19f93ba38a7b19f13498201b897f37f246486050873de5877586702ef1fdf5
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10284 bytes
SHA-256: 66ca808b6acd688cab95dced95b645cd868be1c0a0e61686859eb8623b4b63c6
font_02_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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