Malicious PDF — malware analysis report

Static analysis result for SHA-256 62db50e3dcf8ce70…

MALICIOUS

PDF

71.7 KB Created: 2021-06-24 08:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c6fc047b1f34e1e35508371044c7c7b SHA-1: 735057ab92f8ba23d15f611ae89891ffdcf85ede SHA-256: 62db50e3dcf8ce7026c54f12636e2b2475e1d7a64e3fc4bde5d518ec29767aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • 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://oniceh.ru/uplcv?utm_term=askep+pneumothorax+pdf
    • http://a-kamen.com/userfiles/file/kuvulodazotogasidimose.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/edbeb0eee1496a0f78cf3a8b27fbd398/82242519703.pdf
    • http://anhbanglaw.com/userfiles/file/diboroduniw.pdf
    • http://magendans.com/imagefiles/file/zozijinu.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b147c9f1bd816429ea659c6bc5427643/dozejiramubedaweriferekan.pdf
    • http://robalton.es/Albums/images/file/%5C/86156562134.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l0rmt4j94i76a2gv88ssfao5pp/fawujipiralotilezorit.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/reirjqj27q9i54m8q1kk92hmh0/628806967.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tusqti8u4hd3cpsnacd1dre5b4/37477344812.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e255a068---fubawewujoxe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iku6he48u7rqadvthubdh3lhp2/11897565738.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a75a2a57e---81270384034.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ecef62b20c6e1d54a04510b0acb8dc02/fokulawovawenidup.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/c5mqqauibnolvkjvtnt59dkf2o/tavigufivixobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3dd.bin
fc0648202fd6df70484428cff9617b358ad7a836abef343bf00c5349688b9f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5372 bytes
font_01_sfnt_off0000f5fa.bin
8c462a8f8b2049336d8a25b09d6732da0254468806ecd41d2ac06038daf3f764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10172 bytes

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