Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab3ce87034ea64d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 07:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d81d46e19f93b701cb9ef1dd2bc89cbb SHA-1: 1e200f8a3e45f80846d341d041a09fb3d222543e SHA-256: 3ab3ce87034ea64d9cffd33fa628b1badccc02fa407b0b91ae7f3b2b857a8e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c484414890---lukizen.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b2f25b8c6---vawujozegi.pdfIn PDF document text
    • https://jambukuning.com/contents//files/10516620280.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/xudufol.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/87553386416.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/96550662084.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/68694392500.pdfIn PDF document text
    • http://sam-global.info/files/file/38533295947.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c765abb55---giwure.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/11957755839.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fa3801b7b19d1eb680f9b904a5ab0203/latimesopexajuvakij.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/73887810519.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/23694887878.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3e464e03b8d78d73e128e74072be00b1/46185338351.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2k3apubddd0s1k85ctqhceof9i/97404731544.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c86437f243ba9ca2866cccfc6eb80dcb/xoxasav.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609265eab1b51---4613816020.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/4786004080.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/mavafilujafegubi.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/80765391080.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab094689bf---tavuxivexeve.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vf0ek09lg9ns81bkn8is80m7rd/tibujotugalezuwif.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104747a7c026---xusasapobedaworenax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=high+school+insultsPDF 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 18116 bytes
SHA-256: c046c183686402e4b9e5e89017ac2dbfa00689c286b334f19493062e51b228c2
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10204 bytes
SHA-256: 3b6ea5422f6586e1fa992450d25760833f481d62413b5d79e54b6cfe50e26c62
font_02_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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