Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff41e7dea2f31c0…

MALICIOUS

PDF

104.2 KB Created: 2021-07-17 10:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b0ee8301cc647b5c3cb47a4b47001e0 SHA-1: 1041eb3aca883a0b0634742de957fa80ced6ab82 SHA-256: 8ff41e7dea2f31c0b93d5ca97f61a368053af293f1f692d6dd203b905ff4c9c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hyundai-dongdo.vn/images/files/48664715464.pdf In PDF document text
    • http://sewakendragroup.com/userfiles/file/33676841990.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kc5halt3l6no2u63k1s3pil1e7/furabawisawevogemexif.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rl6r9djh77c28cr546poa72ihv/vazegewotejuvanikurabo.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/76579799837.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80c1f17b---78213928680.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/88014391986.pdfIn PDF document text
    • https://unosms.us/userfiles/file/33958863613.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8ac1df542c0175595951c7f732db871e/60113618342.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/373429b702ca98616c589696e948e4f6/xegirogafukimewowovadatax.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/23853442667.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cc5c2d4d789d453782d44d81dd5c3cc1/meposesibesulepanitaxanit.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba951dcee54---76720387843.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dcbe2ca1733fb6ba3e36a7379ddcbf73/13250131199.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/275b6d71e8a145eed2591d7cd5108c53/mijisuwogulimefetaxilor.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2eab94d30529ec006beceab1db7831ad/61864986273.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/3430032699.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1b2ab60c1012fc18c4309ccd610f4c0f/xibubego.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bc61fb98---kijojo.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/kanomuzegopaguzifonariva.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/pazerunat.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/252036552f05408ffbf4a5f6ea7ab78e/49836004681.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075eeefe2e49---45441558072.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/17704553265.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/186736ea291421a9e703c761d8ef0f63/tilemavefexixup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shape+and+volume+of+solid+liquid+and+gasPDF 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_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 11132 bytes
SHA-256: 65804df548605afe2f0697c12f23a7558c3197975fe8ce87433ebb680084d138
font_01_sfnt_off00014c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A3 17828 bytes
SHA-256: 571c59890d35e283294a9ffe2d85691637419065f6d0fad44cc20b6b2c092193

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