Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d969f4abe6faee5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 03:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4dd015e401b4a54c2371631987d0779c SHA-1: 20f17a39b2dc4c718918d1137853d71151aa983c SHA-256: 8d969f4abe6faee53fe612fad371bfb1c9437b5a92e4545cc309182a5ffec16f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b95ad73ac8e365698002095d68fbab1e/wamirovajasewuve.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0219a4f07eb0fac29faebc0672693f98/76418395833.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210820162540.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/67387694179.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h743hda0scl5ps83978e7dkf26/39571552874.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/46741252026.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7b43b1eb30ae5bb312356932b6c821ec/45877839183.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a13a7bd7---49894944647.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a179b0c8e88---kagigevabob.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf5898eea6---zipibiximabaxeku.pdfIn PDF document text
    • https://empresa-venta.hr/files/xopemini.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090706523916.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/k4adrg7h4351dp74lhj6uov299/bamibatumit.pdfIn PDF document text
    • https://eclearusa.com/images/file/vevozomazabawemomepubopod.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/futaxomezijikenigivoro.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/jegarubumudodukaw.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6b4a160a97f7c4ad444031bcda603e39/40003255563.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/94401596406.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/kalolidiwemutejiwodivuku.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/44211165843.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8907ec5ba---jetasefokevutesedegexoli.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/nizowupawuwubom.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/70701140441.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ac0021ccd---mexevurutetajuzabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vanaprastham+novel+pdf+free+downloadPDF link annotation
    • 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 18700 bytes
SHA-256: 53de628cfc9d9d60d0f8b7d0a2f22c5ef9300796f1fc415ca9da4d489e69912b
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10792 bytes
SHA-256: 1590b9aa59ca1d4303cd99440f833c3d92afa411a76f00c9621580686df3b2ca
font_02_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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