Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb319d6bb357bd1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 14:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f349d1ffc448397cbbc14fc23f64f217 SHA-1: a45ef2ea854ddd815479141bf54ca08c2de867e2 SHA-256: 7bb319d6bb357bd1e093c8e7437f03d2480b0f951978d2e8fd7ad67f06cd5463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using the document to distribute links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mollis.rs/files/72365133637.pdf In PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/miniremerimufikadele.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/96307590637.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/fomoxiberekoziwen.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xoxefesafegobelaf.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f928fc5e1016638e1afe2ec7e227331/26314314685.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sovujofamage.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/41199133354.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nb9417hcmf5hedivaj8timi3as/desedinixeziwajujedagud.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/ruxamojakibitoj.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910154303.pdfIn PDF document text
    • http://berbun.com/user_img/file/gasamugedawanasesotaj.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/71401416848.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/vidurega.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101600347596.pdfIn PDF document text
    • http://tercovci.cz/files/file/59551328926.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/21351779685.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/34244045782.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5360125b---ditatojizekawojajefu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/74949983530.pdfIn PDF document text
    • https://chineseclothingonline.com/File/fuxorasitokot.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/72305092751.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/lutetedibodemile.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/wupufotubiwuseserikagug.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/pajavopowewut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+fire+play+store+installPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 18484 bytes
SHA-256: c6942db59d45a7c5d39f0ccea4881e2afaa703f21126650673255a0c2a85d870
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 10440 bytes
SHA-256: 8b06e2c53dbe40877733739bc8e828ec91340680d02302d66a91ec724082c229
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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