Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d519f753f2823b9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 14:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b717e26237c8886326a6caf0c70c36d SHA-1: e58c687c9fc45255f1a3d5fbeb28736849043e9a SHA-256: 6d519f753f2823b9c620d2b98beadc845f296f62b70f99acfc1901235fb86af8
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://3wsystems.com/shipinc/userfiles/files/57962617500.pdf In PDF document text
    • http://stilistspb.online/public/files/uploads/files/75607524751.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/jozonowolegosedabovofifav.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/86075244886.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/61741599732.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/8723281051.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/66343526708.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/seturuponajiwojusipusir.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecc39b588---37131719753.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/fajedis.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/feliwevijarutez.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d1fba9503a460c7f2fdf77eadd8cf3b2/18659062380.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/88724998322.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/gasogisokakofizogugofa.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nemojetumopopemobatif.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lamowekowebemifowajeb.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/funuwid.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31e69c4f9---82827513920.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/wuzapunudobemogomufadagon.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54983620843.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50143211297.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210908050435297698974.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wesewuvikefiwatetinep.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/soremamafuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=react+native+component+libraryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10732 bytes
SHA-256: 2fe7bcf30a049c2459d02cd15954cbf043dcd8f4286e624ae18fb44a01d9addc
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1