Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0df14f24816887…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9427b9f74f93c4e7ab13e08099e0ea9 SHA-1: 5ede9a3b20a172ef5422bb7d9db9c122b18f121b SHA-256: 3e0df14f248168873fd19773192111c97069d76ce77fe237f0d348090d4eb732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=what+is+the+depth+of+something
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d6e9a905---sativuvasogujitesefilugu.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebef5b3db---zutajiveg.pdf
    • http://sushi-belovo.ru/files/naduvezawomafovoxip.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5231d09c---63258504658.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rpvj0tv9prbpomtmg9fqls6tm7/34097912977.pdf
    • http://aliceinformaticasrl.com/user/pages/molenetezijol.pdf
    • https://aquafilling.com/userfiles/file/kubexikofizunolaw.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jc58cshab71jg7q1ab50lt3p1v/nozudobobapusebugebazadil.pdf
    • http://sahrugs.com/userfiles/file/42746096314.pdf
    • http://nhs-carpediem.com/clients/46367/File/82912715013.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608671de9d976---60831919104.pdf
    • https://serka.com/serka/upload/files/logofup.pdf
    • http://asiadomainstore.com/userfiles/file/nobilupiberipunodubawi.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d58f3b2f1e238980467a581ce516bf76/koxuluvasibawopabodulidis.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8629cb1f8---19616652761.pdf
    • https://efnnma.org/files/file/livitukatuwekofamaf.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/634e0a7b35ab3d3f783075c740c7e1c2/36533728703.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/90dd923c9cdd2bc6e011aa21e9d62b72/joxuvogebugifuwifeke.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d256349a07---vuzowelerava.pdf
    • http://www.asslar.de/downloads/64955348896.pdf
    • http://tomlitkom.ru/ckfinder/userfiles/files/36848653072.pdf
    • http://aarogyamedico.com/userfiles/file/75932030551.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c0612a7a---setidozazet.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8b7186b72fda309dc8640c4e53ae3777/2905933095.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_off0000e6b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
font_01_sfnt_off0000fed0.bin
630e2aadf83229c1cab1957ee5c8a249577952d18edb2e730125a74658344ade
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10792 bytes
font_02_sfnt_off0001174d.bin
69bf93a133dd0036f5702e60a7ea9349a6e4cca7617187629e1dc0ad09252899
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 18316 bytes