Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9cf51317566b6b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 18:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14bc9c1caff9e9b43c811f5bbfbbf63c SHA-1: 766126a9cd7c757339af53a3c63851b763e78e60 SHA-256: 2e9cf51317566b6bb6a0c5c3320dce56ab5f9749afafbbae29826daf6abc941a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880a1adc0---23280328818.pdf In PDF document text
    • http://seabeachthailand.com/UserFiles/file/fijujojexez.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524c07b7c3---7588555232.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xekodepilosoxapawuwaxig.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071673079185---fivimorefosenuri.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/15421009765.pdfIn PDF document text
    • https://telenovella-bg.com/files/91248311714.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079c98bc0f03---zosukin.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20e443d612b6c0552447585fb9557be4/5388708614.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/fimolirikumorogixup.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/adfd221eb9d541c7bc80b7a22aee317c/rizujole.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dujejavaseg.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb324998e7---zovowawejeb.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jogovatetimotigavojel.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/bebod.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/83d5b37aca6c03bba53757a4e24d60f6/lewelenog.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71542770555.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/76993142808.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/48895140264.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/womolamom.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0950e7d046---lataxopasizi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160731c78567f3---19391840545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=continuous+thirst+and+dry+mouthPDF 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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10580 bytes
SHA-256: fafca4c8833647676b7fc381dd416247c939dcb125313ba86bee2ec9bb5e3abf
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 17608 bytes
SHA-256: b28aecaf8356f3612772f0448d3817db9d941aad246793744284d779ba42bc8b

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