Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0d6dd41a5cf25d…

MALICIOUS

PDF

92.1 KB Created: 2021-08-12 07:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e5a41facf061478e46c9d076a7405e8 SHA-1: 43696df5c03a7f9b9819ae93fa7b7ee339f72743 SHA-256: 8f0d6dd41a5cf25d24aeee5cf90f3aa558fef0943ade4969a13f567e4d487c85
164 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 critical ClamAV detection and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the interpretation that the document is intended to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=provider+satisfaction+survey+template PDF link annotation
    • https://davaocarrental.com/images/file/62681933507.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c156dad993---49896627475.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0eb277f836ebae29d26a884fdfaf7510/vazedorog.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/87581373004.pdfIn PDF document text
    • http://bptramptour.pl/files/file/68003484307.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7299126aea---gavunutoxobal.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/64866264289.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9f50fbc23c5eec155d51e3a96df4dbbe/kiruvagutotate.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba64197a2---64769253621.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849fb5a8ed6---69408510946.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/53085748151.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/vezizik.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609761ed73cc8---luvalipetiva.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608046bb08d7a---tuxirosomokijixopalev.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/55716aa58b52c2301aad7032c330e817.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/jatidujewiruwudaxi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d8865346dd07bae59ee904ad87e09c9/16126062496.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/468fa4c0f7a179f49b92ef9fd6f6c20c/21550897637.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2050d2cc39bd2236c06d92c114cfeb71/33793746656.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/jiduzimipegefoxitofino.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/81375111076.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02e1dee24---mabutiludowabujejezapiko.pdfIn PDF document text
    • http://myslizdrave.com/soubory/94850276860.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2f4087b3919480084aa83f4dc5f4c5b5/jedirurifumozepofotaxewip.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_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 17492 bytes
SHA-256: 4e4a9e1492d1a726d649f037d5cbad5c1a09cf2889ae9f3b6f1a2495f0a841a9
font_02_sfnt_off00014862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14862 11064 bytes
SHA-256: 6ea336698bc5691047d7f28a867a5cbe10534516197da1bef3d8740068f493ab

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