Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d11261595ac724a…

MALICIOUS

PDF

82.2 KB Created: 2021-08-28 17:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42414fd8ca2834c4fb3fda2dda214595 SHA-1: cb22d052bca623256c82dd81f6e163515e8d61a9 SHA-256: 8d11261595ac724ae107a94d619c56c441c6348a8a6f72320e2b54184d711324
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It functions as a link farm, with numerous URLs pointing to external resources, some of which are also PDFs hosted on potentially compromised sites. The heuristic firings indicate a pattern of link farming and the use of compromised WordPress uploads, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=to+be+continued+abbreviation PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/gogiz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/sawasovobawuserun.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/97628011971.pdfIn PDF document text
    • http://belloverde.net/emailer/file/zotubuxuzev.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/puxarakupigixexisovevuke.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lubuvetiporuxabekimal.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/6378618273.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dibowafuv.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/wixofazifibigademedax.pdfIn PDF document text
    • https://hirurgija.me//files/1407125525.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b93d6ea4c931e03baa80ef0a8416429a/dagevubuvovi.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/74300814717.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mo6g8ef3sc7kr8f8bt06jv9p22/bagemuvabasurenagumised.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/68011290368.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1544981cb---72543321403.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gavokelizomufi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/najiliwixezoruti.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/buvopilebevesukufimisagi.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/nozor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74f92086a5cbc8b52e56609fe27df983/38600839617.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f97885e1---sexikatetixufo.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/99128617913.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s3uaam8baaf5tlgnvkaputb9s9/xosoni.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/buvamovepebagowid.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/91ba53d424e39668c07d14c2263db12c/dejituzo.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 18900 bytes
SHA-256: 1c0dd6c166acf80f01b8730f42af245e113fa1d2e707323376018691cf675a70
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10416 bytes
SHA-256: 569946f4a0044474686c1c128b5ade4d9704c73e5aac390812facb0393e8a13b
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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