Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9d67aef8286c5e…

MALICIOUS

PDF

90.3 KB Created: 2021-08-01 00:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1901c41684f540d3254ef8774df2b68 SHA-1: 190e4229799c07e42d93132d236d3ebfae6c47e4 SHA-256: bf9d67aef8286c5e2cf3924d1d967d4ed51a04c6e21994be29408df0314d0d39
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811234c8d82---22352309070.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/25500663885.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/12f2dd2f0d9454f6929579e13d51388d/67041435977.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9eaf46aa3a7282084db1d5c5329ef93e/jafolalarizaxetevare.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab38b965aba367802c338bae167ab27/medujodag.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3df2ab9fa---77388430900.pdf
    • https://circolodelpistone.ch/userfiles/file/bojunoxakibotexuzadexa.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ec6f27c5a39f6a3709fd1765ea79d438/bivujajawiwizogopasoti.pdf
    • https://jagamimpi.com/contents//files/35974267996.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/bowetuvuzasozefevuk.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/212b44f2ee9b0a05162123cd45592aa6/darilizoruwadugupenapo.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726913666f9---xuvobezakumobu.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/jorekukivuxi.pdf
    • https://aedwea.com/upload/foto/jonokoladugamem.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b07176cdba43faae582fcfca094415fa/fegifudulosuj.pdf
    • http://bhs-class1957.com/clients/35434/File/davebukifotomoveruvozivup.pdf
    • https://ceccargiurgiu.ro/userfiles/file/miwavovoxitawonosorosuvo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0095995ea---datagituzuraz.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/t1hdd8bnisssssku0hlv2s288b/420879156.pdf
    • http://imhome-listings.com/userfiles/files/53428560600.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lisupoeaqk3d76j389th8n30l0/xidada.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kc0u7pb1878gmr4ioovvlc3c30/87620045192.pdf
    • http://drjoecarver.com/clients/49355/File/duwojulejipodako.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+formal+education
    • 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_off0000fdff.bin
08b151a2e66954d115cd56b8b7df480f55cea136eaa4228d5983a5b391a8fd04
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 10836 bytes
font_01_sfnt_off000116d7.bin
7311abebb628fa765df49dca91d4fdcb00ad3f05a571ae96d12b33f749bb2da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 17316 bytes
font_02_sfnt_off0001436f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 16792 bytes