Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdd72ae0eec4db8…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 01:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1085a577ddbbd1b9413c133649717bf SHA-1: fb48948caf0b7ead07979d84e05fc54cc12d7a53 SHA-256: dfdd72ae0eec4db817009a5db18d27039e74368c667f1287301d625a5b68e877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://oticonshop.net/ckfinder/userfiles/files/74436275057.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9a7999937e110a9bc9a8bd76cb3c3555/72294819706.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/67956671620.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/43be3247bd3bb845f72edf920bee9a9f/xejowinakez.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/000fe0db3cad2839616b0388e5d45139/vadimuriguxewelizulevalip.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9216dfb4---46772629395.pdf
    • http://ldbell1965.net/clients/85689/File/13071035426.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/benugu.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pm0psusjd5vt93g72s3truj8j6/tazenuwepagokitejezupaki.pdf
    • http://sistersaviopublicschool.com/userfiles/file/wesezapulujirosa.pdf
    • https://aaaxxion.info/images/file/xexijinowaxuxiriz.pdf
    • http://velocimapper.com//webfiles/file/65118723003.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/82533354833.pdf
    • https://dongcohonda.com/userfiles/file/topagisated.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnanmhnejlchb03me5ed3tq5fd/sixaboteja.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607379bda72e2---30765809190.pdf
    • https://studiorampinelli.com/file/bivuzufuzuvufogerivunalag.pdf
    • https://kaptenhoki.info/contents//files/wewirujugogitogajovusivi.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/ludilem.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/nopesofufozaje.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607365a8ecb5d---21752649098.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6ff74983---81717954963.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a6c12d6c---25703048195.pdf
    • http://mofrantech.com/userfiles/file/gevezoworuninoda.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e3e4f1550c28f5d5886a477955c28a4d/34497039382.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee3ead82e---gimufofurofuxanonozomebu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=class+8+science+lesson+12+question+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
font_01_sfnt_off00010746.bin
df9ffaae82a8f91c9a817ce0bcae6ad1804d64ad862af675d9a70c7bd3cf4ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16836 bytes
font_02_sfnt_off00013289.bin
efbc75b1b2b5d85ace34b737cdd951267d900d223cdf770f5706fa338dbea3f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 10964 bytes