Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc81218db9f266…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 12:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4dfa6f9581ec829dc251502cc12d1799 SHA-1: 94d048ea3fb1777f28e6c8da46e0f2e923681f77 SHA-256: a2dc81218db9f266e8815ccd6c1cf7e0003a82fa07133c48f3ba22e49424a41e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e335ebcb1---51748884108.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ii1l6lmec2r533bsrhr1tu44m3/lajoxegutaxu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc1d2f452---sowejeteve.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/19202865716.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/91738221670.pdfIn PDF document text
    • http://uzmanwebci.com/calisma2/files/uploads/bopof.pdfIn PDF document text
    • http://rafaelokazakov.com/file/42082927682.pdfIn PDF document text
    • http://446888.top/userfiles/file/2217201402.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b615dd3ba---detopukigetafaserep.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/88957708931.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/28701704050.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/4737732341.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160df2abd68774---78672676125.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/70967817984.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b368b1d43---9465172527.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa0edc71c---73166846026.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051203340834.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e22bddd0---wolafibufupaxuvur.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611201970a419---boxopewinoguzizoroxafowi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/grgggh9952urhlt8ep87ir4d02/gevapup.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4ittc2s83mqcfrfoelcgld1ngm/91650655317.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xewofajabeneluz.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/82493454560.pdfIn PDF document text
    • http://mega.kz/media/upload/files/44771264422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=visonic+powermax+manualPDF 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_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 17580 bytes
SHA-256: 11f303ee22aa5990b3008ca963d02bae7aa13092fde629989ed2224c43dd8e44
font_01_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 10692 bytes
SHA-256: 0a4c56dc6e3bf83d57db0f160a2501391092cb69ad90ec69119811018559742a