Malicious PDF — malware analysis report

Static analysis result for SHA-256 690a0745f75e6f89…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84d1961e8b777918b0a2ccff83d6321e SHA-1: ae4ebefef013b90943a8728e67547bf01e8d7955 SHA-256: 690a0745f75e6f89969cfab9f75ca3997b577e7eaae755065a5ab036ddc1201c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a potential distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://tunglamgarden.com/images/fck/file/94103251118.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pokulefudeka.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/47909461039.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/10676093183.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tojusonaru.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/derekavavotimajuxugofef.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/81881577330.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/govaxazoronafodapirutorem.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zunodegu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/repagelikadisomusu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/numonurigekenutas.pdfIn PDF document text
    • http://herve-coiffure.ci/files/82517485471.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465d6978918---73636454924.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23238441785.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/geponukefof.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210907_429A0B3DAA47D542.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cebbf0da---73127554674.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/vowafanezalegej.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gosiko.pdfIn PDF document text
    • http://gabortech.com/admin/file/25672795988.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/64722913654.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/simasawawawuwojuke.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130218c03753---dasisilaronozosovamivoxes.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rekanifopokebemeduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=angry+birds+space+2+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_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 11032 bytes
SHA-256: ed39a0db9a91712750fd99d6a95429332a4443edc1616cd6fcdba586b6731c73
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17720 bytes
SHA-256: 9c2c96e6596515b0d86bb4b19b3c5694f657c5c9af57959493b2ab73627c7983
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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