Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0790e966aee0aca…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 13:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 396126c16bc5c4080acb2dba83663498 SHA-1: a70e77a7ed01d58c9c1e364504b29b14c855890f SHA-256: f0790e966aee0aca90ee9b0c4bfec1d321752dc2000f8777a9377844bcb89708
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the presence of a link farm on compromised CMS uploads points to a likely lure for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074506307a49---kaburebubipotilematamana.pdf In PDF document text
    • http://namjapizza.com/app/webroot/files/kakozuvadabesako.pdfIn PDF document text
    • http://kimtuong.vn/isc/public/files/fckupload/file/jatuwivovijefo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/23413630001.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tld74dlv4ii8trevs6kf5i2721/48677919290.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/nizanuxowulat.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/kiwariwozuvamepefusuve.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2f6f9c3bbe6ac9928b2d008ea9919c0a/jatabi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jmavf9dmfnu36jv2a7gcjmo1lc/zovor.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/57142509185.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/xojezugogavunep.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/ninojetinuw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119c36489450---77431371086.pdfIn PDF document text
    • https://laps.pl/userfiles/file/lefav.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/09a3c2e916da7a3ed68596678224d30b/61411179031.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cvehmlke2jsqj5b1pho6ijg37/83940387986.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8c3b628288243dea3b1e10221c01fb38/12356117936.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/50977030898.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/71635106501.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af193c3a6---menezir.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/relitepapatasip.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/37421259996.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/lufudijalolikofugufesubup.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/21845564941.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/04/gojasaje.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/47858727775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=7805ct+datasheet+pdfPDF 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_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10672 bytes
SHA-256: 48859e63b69e422361eef46e8a8297aeb9df00638241949440fb8896252bd259
font_01_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 19752 bytes
SHA-256: 375f85355c6dc76d417e43269032f3ce5afc54550ef6e1760bf35163e66c22db
font_02_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1