Malicious PDF — malware analysis report

Static analysis result for SHA-256 5060bda6d9428034…

MALICIOUS

PDF

91.5 KB Created: 2021-09-16 13:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0afd0b4abdf341924ea3a3b0b604a1d8 SHA-1: 0b55b8cb5450664612131e824bed9f95411c80a8 SHA-256: 5060bda6d94280348d31285f14f4c8192ce3aea891b5151897b0ddb320971fad
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents hosted on various domains. Several heuristics indicate that these links are non-clustered and hosted on disposable or potentially compromised domains, suggesting a phishing or SEO spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lostfoundglobal.com/userfiles/file/minuwototufaz.pdf In PDF document text
    • http://halongbaycruises.org/upload/files/dugemetesigab.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/58601330798.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lerugepifefopusin.pdfIn PDF document text
    • http://geraldinekilkelly.ie/44739168708.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161314d185aacb---luwufa.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/7444992067.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/lolasofizubularuzijuxepif.pdfIn PDF document text
    • http://livestocktool.com/d/files/japodutegovarizake.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/negoboz.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/rowanotasisisov.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/911779838.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/mosigetidevezigowipesi.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wupedogoxisijawadigo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v06a9m0pf9pqo0213fjql0l7g1/sagobomutekenazigobe.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/nulunimugevopaju.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d7bf19e2---guvana.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/duxanineziz.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/85658657702.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/87994730532.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/63811743950.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jatoxeximasegodofovidu.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/41712285228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+green+romPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 24160 bytes
SHA-256: 55b1ecddd42c346198a108c2de75e93b5da82e07fb362ccba5c6b5ddbcf4ab6c
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 9980 bytes
SHA-256: 53944689a14f98f879d67259cf3e2be68834e4458223a60d24da886dd151c9ba
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16300 bytes
SHA-256: f41c735ebb8c225cb3c622134e03ef2d97531e2d764eebc5fa3bdddb1d104e4c
font_03_sfnt_off00013fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000157bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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