Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6bdce5fa4024fa…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b13e95bf3e1e787b7ddfcff1a93a7bc SHA-1: 21758d7ab19b55728eebdee4c8f16ab3a9e7319d SHA-256: 5c6bdce5fa4024fa3ab96da3a9e735a3c26540bf514717a2b7ab7ab5e513f94c
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, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=gitara+za+pocetnike+knjiga+pdf PDF link annotation
    • http://abarappresentanze.it/userfiles/files/3542845502.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/nibuwawidifinado.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/20462346100.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608632a71ef19---53829708340.pdfIn PDF document text
    • https://manenshop.com/upload/files/79633880213.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/16059153060.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16120b1d0534d9---loranugipoduzizuguritu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b0aec9f3---miwutavukuzosares.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/55722176256.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f6f1ac917584f93303a9ce10fe7fb98a/tewesabutuv.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/wuxamanimuborivojaru.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/14975906522.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/bubosarewukufapu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0f874a9180000582b1f8776f68932754/jomofigupi.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wamamaf.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/78319177286.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/33756340181.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c7155b3ad7ee8366f2ae6a0843d229bb/tugevubeludulukaziku.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/33448662258.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/wopipopegilonudu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/26246aec958505f7d9e75b10088da5d8/99633173097.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/8558634284.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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10904 bytes
SHA-256: 3643a3334ae114698c694f6a814d207fcc02a8f9944d83ccf1ecfa22805c85a3
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 18788 bytes
SHA-256: 6e024a3609039fbda5f7d560c36c23d773d6a984fa5a83ddd977786e06a76544
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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