Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef2ed466e8d90cc…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 14:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb79386a4e6a2e1202251aeb8ee7292a SHA-1: 1dc174b1772dd3344496ea9422ba288384123d93 SHA-256: bef2ed466e8d90cce21ac0ebb40f8fd3d3c75515fa4bc97a0785a8b973955aec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further support the malicious verdict, indicating the PDF is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144482668acd---83121699431.pdf In PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/46383232148.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e94f4fbff---32898165860.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2068f1afcd1c32a1bcb6d795b9cb3d1b/96899200707.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dumevul.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/26720080893.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ef70a914b1e1ea315f37a9b5e0de272/tebodevokoxap.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b17e191---xepigaf.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/98723826944.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/67181282301.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/mofave.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/32007599353.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gefavefepija.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/83066751599.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/vezesunivivateguj.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/tobuxopuxupuzufeke.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/zojolugofidez.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bojuxodudexixetozaki.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/vilowirapaluwogusexuv.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/94381681079.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/61977756628.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/begosizojezizixif.pdfIn PDF document text
    • http://panova-art.com/files/file/nizumokiv.pdfIn PDF document text
    • http://surestegc.org/documentos/file/morevelebezexegedusej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shadow+fight+2+mod+apk+2019PDF 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_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 17540 bytes
SHA-256: be45883634f2accef569bdd3546057a9e903edf33bd81a9cf59a43080c1efdf5
font_02_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 11108 bytes
SHA-256: a5f2332c3a802a2f21f7af8acdb730de11f7ff7fa2f479a8b60b2445ff57623a

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