Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2f648bc4f105aa…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 16:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11cb1a5411342a07e7ae76e5b9007063 SHA-1: cbdcf010868af76fc70dc5b19bdb37bb3df666d6 SHA-256: 7e2f648bc4f105aa4b8b7222b9556a2f2d9bb6e0a5a19685409ed545bafd4972
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=drift+racing+2+mod
    • http://agriturismolescuderie.eu/userfiles/files/34858085163.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vijuraxawevajetipukefelot.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/fubiti.pdf
    • http://charivne.info/images/file/6969111450.pdf
    • https://baigiangtoanhoc.com/upload/files/36674484252.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/94296456424.pdf
    • http://locnuocvietmy.com/Images_upload/files/53691994699.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vimuxudovegaxepemewilafes.pdf
    • http://pilot-market.ru/new/files/file/49723578923.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137553adccb9---kezegasowuredadikuwet.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/55409202e7e57762029129a8d6fa67dd/razixitubet.pdf
    • http://uk-finansist.ru/userfiles/file/vatura.pdf
    • https://maxflowfans.com/userfiles/file/67445656493.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6dqk3d6b2304tim9stn55gotls/47607289781.pdf
    • http://leicesterbiketec.com/userfiles/file/nifapudofatadawe.pdf
    • http://keralatravelpath.com/uploads/file/34273942760.pdf
    • http://adgroup.co/userfiles/file/ximudexugawowu.pdf
    • http://naturabliskociebie.pl/userfiles/file/22989209620.pdf
    • http://neuchina.org/userfiles/file/10364597705.pdf
    • http://exhibitionchannel.com/upload/60861515996.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 16792 bytes
font_01_sfnt_off0000eacf.bin
8200eaa687b9e7a9f337bf2fef8878ebf663dd78dc52f4b2071eced33f5df092
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10592 bytes
font_02_sfnt_off000102d2.bin
c705f23dfa71a82da593a708ca9e9a04f704230ec8e7be05ad72733bae1fbe3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 17012 bytes