Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a136ea2ea29704…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 09:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 309d70c65fe17881a6238ab7d556ba8e SHA-1: 5097e5b34891bbb096bad4eb0b944f4d4c13f3e3 SHA-256: 81a136ea2ea2970410e29433fde091db837b33f65a669a136a8396b41bb5df91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jualumnitoronto.com/editor/uploadfiles/dolepuvuxag.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/wabijibapefawakajuwexefo.pdfIn PDF document text
    • http://wych123.com/upload/files/fupetelubemipixofuka.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dawolulu.pdfIn PDF document text
    • http://c-six.it/userfiles/files/dosuka.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/11868564744.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pexetal.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vesuzi.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/32155099965.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b8ad190---sadeweridi.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/7095464667.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/58510137664.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/17230019953.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/muwinusemep.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///89284196705.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/webutoramomivupi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wabezorururexa.pdfIn PDF document text
    • https://noddy.nu/images/file/sowojolidanuvewedewomoluz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161441a1fe74d9---54490087751.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/qhrijtf9crbod1vd4kkufluqod/32389339948.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/pizoxezajulejebab.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/silakefukenebota.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135076822c06---vupewelarelopofugu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dbff16219025be8dc9f6575f7767d461/sudovigeroduvebej.pdfIn PDF document text
    • http://balone.net/_upload/file///93174539746.pdfIn PDF document text
    • https://pratham.one/file/53471566460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ml+hack+damagePDF 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_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 10220 bytes
SHA-256: db1902b02686294d275f98c2564ab3e2183811e46dcc2d45af6e6a96c810414e
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 17664 bytes
SHA-256: 77c594fce5312f90ec0a02ac7985f38923de052bf0c184c4da194e65b8fa7f19
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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