Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcff3f2cccdd6e17…

MALICIOUS

PDF

99.0 KB Created: 2021-07-03 21:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ff1a4be7dc4aa5696ed74406b2b25d7 SHA-1: 1312bfd2b6c63696c749b3bda4085a441cf4a2de SHA-256: dcff3f2cccdd6e170a9fbff4a43d6b22d4a42f786b2f6604aec11bf4d8ce7d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=the+story+we+carry+in+our+bones
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0927b985a---pebubobopej.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qb7fqmjhk91vd6m34lda7lpf2h/2817482472.pdf
    • http://studiosimonepantaleo.it/userfiles/files/80524401791.pdf
    • http://asustainable.com/global/file/pazolosovomabonarutaz.pdf
    • https://autoprofi.ua/userfiles/file/zelumugelefidowozomoguji.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/353914b278e3809e70116daf7939dc6c/21487201228.pdf
    • https://campermagazine.tv/public/file/79835176401.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a38d6cb7---dijibisugizelokogod.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949108b9a75---99267426787.pdf
    • https://next-engineering.com/userfiles/files/46942563551.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cdfee7984---71175882435.pdf
    • http://logo4you.dk/userfiles/file/vudovetojoga.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/82219873606.pdf
    • http://fatamorgana.fr/uploads/assets/file/37726131590.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a755715810d---fikilevubuk.pdf
    • https://immo-macedo.lu/userfiles/files/27209430565.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c76ef260667c235dfe6edb38dee1c597/75979634548.pdf
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdf
    • https://nasroglobal.com/userfiles/file/xuvez.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebc1b486e---41689432668.pdf
    • https://meccanicagambirasio.it/file/4058525782.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a824596e17---bafopinumujitananaperoza.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/13105664405.pdf
    • http://broadmoor79.com/clients/864886/File/1531817162.pdf
    • 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_off00011db6.bin
5dc98c80c59c35f929e3a7967b527db0d6c84de9787df2c58e9437eedba690b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 10684 bytes
font_01_sfnt_off00013651.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 16792 bytes
font_02_sfnt_off00014e63.bin
16b17ce17f110c2b6309137d47be5ce016263909867eed7954af75ca06baebc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 17804 bytes