Malicious PDF — malware analysis report

Static analysis result for SHA-256 f459b614249df7a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9387d422adac0e7ec34ce71d5efed4b7 SHA-1: c057c2c61636b7da5bd4bb98a619a291b103d34f SHA-256: f459b614249df7a46ee1a4b469a558f4f0d1f3c85cdaf958deaa4fce1a3785b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/87555955028.pdf In PDF document text
    • https://ultralloy.net/upload/files/wugagatulegoxumog.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/nosuverutuwujodukizokuk.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/45836335285.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/zazalikuvogeguj.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/33162601134.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee09da8b49---dezatimazixujukurivugomux.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c1ef819558bba0205b070c1b187f5be5/76691334096.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/jufazasezalotojagi.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kebexodijed.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/gemufebanuwej.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161313ced3edc0---75886389009.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/73256157882.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/kipajobin.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ef4daf1---78638187174.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7bd065ec525392dc462a120d1fce010f/voribipabijagikusujetavoz.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/62275253951.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • http://zenithmetals.com/files/82776765307.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/sedijuzazamixutaxomidux.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/tovodem.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0e623e7429d47cafef55f3644c0fa79/9686297888.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/91720086968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+games+free+downloadPDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 17552 bytes
SHA-256: a56c07a24dfaa387d60e4a4e8aec941e8f3cc146cb0513f81cc25aa4731bb62e
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 11072 bytes
SHA-256: 0d720fa6b9d66adc4856315e4ca49c14552cdfd3eeb769ba9a1a7bce570bfae5
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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