Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab266d9d08e2be5f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 17:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d13839e55ae68c7d7b7d81e102b0d04e SHA-1: b4b8a26536c843d35f634ce46531791510a8b556 SHA-256: ab266d9d08e2be5fc8006e39e22afbc0e8a1c8c5ec58ee5a886fbb18aa5d6705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites, many of which are designed to host further malicious content or phishing pages. The heuristic firings indicate this PDF is part of a link farm strategy, likely intended to lure victims to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=bach+toccata+and+fugue+in+d+minor+pdf PDF link annotation
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dumesafoxevavetorokalo.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/39171525952.pdfIn PDF document text
    • https://digiconelectronics.com/media/33294213550.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/74673668000.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec71354fbf---33022024949.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bf1ad6cd27e5713fff8a18fb85b3b9fc/71023494313.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/53660508878.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/48764466992.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/70467882663.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/2955812644.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xogebilopevunepesapidumov.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m6kb2racf8aqivp88j6fak13k3/bavibazo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/33583433037.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/dumojoxiwo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vefovewemosobosog.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/49442948225.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/18726869395.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b2fdeqir6l19ijjueok98m763n/53510484338.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/78731274820.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/bumogudatilukulafodur.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161433d92e1ef1---94165051320.pdfIn PDF document text
    • http://usateatop.com/_upload/files/xexif.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/ripemebu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d874342299cade76fd14aa6d01ac1d9/99918835229.pdfIn PDF document text
    • 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_off0000ba90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA90 17340 bytes
SHA-256: 80ca73bbf9efe55f0467210406adefe0600fa19804ccf594a54cb5be7c51c1c0
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 11008 bytes
SHA-256: 3d5df9f078c083371e0899fcd6f877018bc8aa93664d92dc41162fa85766fa45

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