Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2641fdea1f9739…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 14:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d25fb95359479663b05bc35de624cd55 SHA-1: b2a345e9e035b74c67be136e8c6658465964e38c SHA-256: 8c2641fdea1f9739ef44dcb5a0ce58f240d2bc024962c2a692da5c2cba46a1a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bharatbiodiesel.com/userfiles/file/mefoxoligitoravewakimum.pdf In PDF document text
    • http://hpcad.pl/Upload/file/79568872484.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/53762296082.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614052a0c6f36---netof.pdfIn PDF document text
    • https://premium-house.uz/images/file/gusezikenizenuk.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916004925.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6511028afa4e77b7884961a056842d47/zatamuk.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/tumusosorumurigimimewev.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/petirafes.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vapodurogetobewu.pdfIn PDF document text
    • https://cristalensi.com/public/File/98621520051.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/wuveliziligavebomonijeze.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/12858815090.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/fikoxedamubokevedowodub.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_A7305031A48F2C30.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/soponivovegakadowefufil.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/49291496886.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/18468839939.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/76965748698.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/36663980492.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161369f466a6a0---57186132078.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1rjo7hvnfbrbij50qvprb5nrb1/54250764966.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdfIn PDF document text
    • http://www.puhito.hu/uploads/53396239774.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xibeloloduzapuxowa.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/luvajazigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=top+10+music+player+for+android+2020PDF 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_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11152 bytes
SHA-256: 21ff0d6cbf03db52612d8fd132ddca5f812176edcc3e47425a024d7bd08f3541
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 17532 bytes
SHA-256: 0b0cb509fe1b1d30dd85742784269c8086170eecc700d0b6e1db67c5f6cee99e

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