Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb0c691ab7eec54…

MALICIOUS

PDF

103.9 KB Created: 2021-09-01 05:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f24daba1e2ca06dfd18ed48c3a20d426 SHA-1: a0e82b65f8b41299cba1145e974480454eb00477 SHA-256: cfb0c691ab7eec54033ef5bb846ee4dc2ea827ac99906f33907d8b60ba80a3e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing campaigns. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pointvirgule.ca/upload/editor/file/45094161765.pdf In PDF document text
    • http://rubivina.com/Images_upload/files/10233822281.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/59361609648.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/43278459535.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef36c01a0b---20514460356.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62ac854ef---jadez.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b946efe4a5c---nenukenonukewo.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e2d8eb9c2a85df0d9695761e886a6185/8706819567.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/18760393137.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/31099018123.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6baa9bff863fb72fcb19b10d919db9e0/ludubajokirelafa.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/21248607141.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/8a800e1f79269b80c0a18edbe7bfb6f0/juwojejiv.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/gebofazowikitor.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/wupufarikokenomo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aad6ed292fe---37335692679.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/tixibexosar.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/nedunetiderikipado.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d23b1fcd312fcc21ab38d0b58768507f/17258151079.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/59715044821.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/tejusazegim.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1cb8vh3nk747g0hhhagq6mj5vo/53613230352.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44bf336913108d2afa6f72028d1d15f6/fenepufugipepiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mispronounced+words+in+englishPDF 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_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 19376 bytes
SHA-256: e387bb36b913f3371418bca7721cb075220d12fadbc716e575494a41ac0428f7
font_01_sfnt_off00015f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17770 10712 bytes
SHA-256: 2ebd6359fadde9b9a6484a499e8cb20909ce295e3a43be79610bfd149ec490b1