Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1b3dfd96fbe521…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 22:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a00c81b0d48866bfb51f8fb78cd782e SHA-1: 34fa823b36159d8419ff1260664ade8610bba9b4 SHA-256: 8d1b3dfd96fbe521e4135743c59f58f85b72454772330fecdb6389c931814ebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable domains, likely to host phishing content or further malware. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/mixatuv.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/13710390966.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/riwunilanu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5750451630.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/71a183777846e867a427c46e1f25bd25/dafamabikotaki.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/67081280174.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/76602236220.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/dadawinexoragodux.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35688e9d8---38297691273.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sfuoitptjlqg5i5g8l0vtgp2bu/34674528987.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16217920290061.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/95939556932.pdfIn PDF document text
    • http://vodnik48.ru/content/file/75276861835.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/nujekuboku.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/82520652193.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/jesajanorar.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1dd152d56818b2b09549789a373ef453/jifovevixuxevanijetegobif.pdfIn PDF document text
    • http://ipllaser.in/uploads/jeresirorexaraniwuda.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/9015648827.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gamozutipenugufijefubi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bba3d94664ba827d8abf0075506a2050/98151961241.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/49369867795.pdfIn PDF document text
    • http://myredm.ru/uploads/file/vepibebimitejemojawo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f17f7b969a5---gidokaneluxepanuno.pdfIn PDF document text
    • http://cloverdiamond.com/file/65713956594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hamilton+beach+bowl+rest+mixer+manualPDF 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_off0000bec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16604 bytes
SHA-256: 37ae1499521326763fcadcac1f26d2bd826e133bffc50470ef4741f7a8ba2652
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10912 bytes
SHA-256: 28997c9da73b57c96e39708b90cafc4e07c4b1a075de232c427ee1c6bbce8e6c
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1