Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7fc0de1957ac92…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 22:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75f6a467069b74139407341b9f8024a1 SHA-1: 40e95ec237428764a78c0b34be2112989ae7b5b8 SHA-256: 3c7fc0de1957ac92ceaccff748349009aa29a84f6f21270fbfbfd1d8ad4d7b5a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419e1709b4c---44452733405.pdf In PDF document text
    • https://dnmpaint.com/sdcc/images/file/rejolarojubimigatef.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/27938902991.pdfIn PDF document text
    • http://grimastone.ru/files/48055719324.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/87485367775.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/12965386082.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kukobabakep.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/57951280190.pdfIn PDF document text
    • https://produse-zilan.ro/files/29925861862.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161402eec477fb---semim.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///kiluj.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/15222441130.pdfIn PDF document text
    • http://jn-zhsc.com/upload/72491982823.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/bumuxanos.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pudajijujodawi.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/nafalesiwetodakife.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de3cb4d11d60caff74b8312b1b2a73af/92245345938.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/71c3bf9026292dd82b5a83e3a8d3b0e4/45878189206.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/15131517649.pdfIn PDF document text
    • https://jin-ji.com/upload/files/18746622642.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/51371136185.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/lerewevidojajafemev.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/40336299723.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zawakuno.pdfIn PDF document text
    • https://interconformity.ro/images/file/tizojaramegozavezetebefu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d09ecaccb5ecd3013ad76f1f902f73b5/semafivumokubizenarajube.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/posez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=konami+soccer+game+downloadPDF 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_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 15928 bytes
SHA-256: 24292a42e05343387046a5ec411cfe45a30081190983fe03f37619881a85d1a2
font_01_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10692 bytes
SHA-256: 9f22b3f7a5a91889da9b4bb7601e13bb3ac44a6aac0c0efb16206a93c1c2ab0a

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