Malicious PDF — malware analysis report

Static analysis result for SHA-256 9546c42301806163…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 098f944778e09f1215969df3a86a6ad9 SHA-1: d19c61a61ba5c030b0874e277ba937659c0e9f0c SHA-256: 9546c42301806163573103db6f6e03bece6d45a11e9074ef6d7fabe3e9eeb286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=define+manualism+and+oralism PDF link annotation
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad32ce3279---84963427419.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1q7gh9b4n8td6a44d5sd7qcou1/16978084437.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/9151076881.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/fevapufamopesoterut.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc604ed64---rojejat.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/sgi37e538hs4jsjqeunk7h5ne8/63775209099.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/dexodogepitapasin.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b0320e546c4---38474824138.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33f63b22f---61736314883.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0720ae3697---movebowoduginejiluludok.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/85786034658.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc75a02c23f---5270650861.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/r8j8h8plubono0bpit95a8rqp9/roxin.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/vuruxa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f22de45005---95076496949.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608366cb2f91e---fatebolagomalufuluxakiji.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/vevotivusutawag.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/vimajefot.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/56f8ca728df4be45e06b2dbed2664708/57468119658.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j247amnbqe0sdlkrj4r7fbui33/ruseg.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sevisemenu.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/viretike.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/63998578266.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/maxasaninegab.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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 19336 bytes
SHA-256: 5ddbf8f9caae36becbb1a2e6a587bfd5e5b1c21689f41b8243d6578e4a9e890e
font_01_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 10516 bytes
SHA-256: 2684ee00767d9bd310128ca826bafa2e16cc4a20e70d562f830583a3c7b866fe
font_02_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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