Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4a179265179ac4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 09:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86c9759c4499cf359ec609a524fde2b3 SHA-1: df4fb1de0125e6e6ea898054181594193fdda7b8 SHA-256: 7d4a179265179ac4aaf8e8343cf05810defa730fa48b93f6971662d6040a59fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a malicious intent to leverage these links for user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=adaptation+of+plants+worksheet PDF link annotation
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/33eeb803d5a9f9ed36b5a2d4c5e29d4e/mazev.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/fisuzozujalen.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b896cb215d2---tolisinuxila.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fv2i3qb7iuc8tu05gm1brm936b/54924236773.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f57828469---bukekenexigafotodi.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/78706227197.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/27373631441.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c02391c25---12358208791.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/20886398117.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/73747304263.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/zumekuxu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d52bb681b0a908d2554a951d137a5164/54787568163.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/6946903958.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/37658729390.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/baxalumaruv.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddb902ed0---sekevekemenevikeniluduvul.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f50b96925---26433000950.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac536f5410d---votupozojuvosafevi.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/dijibeperutedomulan.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zazunipezanugivepe.pdfIn PDF document text
    • https://datawire.gr/files/files/rupoluzibelufuzok.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba5cba956---guganajagekezafanexaw.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19807117916.pdfIn PDF document text
    • http://karatayreklam.com/upload/file///sebadegaxobosumim.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/butojufililejatexeweg.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10756 bytes
SHA-256: 0ec7600d527d2e9549ca6cc66dc761f9206a85cff8b92f57cda106b70ca2021e
font_01_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 18116 bytes
SHA-256: e19e727965beea69497dad0151dc17a255b820dfe8e9c2ac64fec598d5bb2888
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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