Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dda02370f891e8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 06:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 637bc981acb02cd4d52767060ebb2e4c SHA-1: 90ab4466854498c5851337e9a735f2a2b6f923ff SHA-256: b3dda02370f891e824268fdd0e16e86c883e9c0bd494b3a66005f6bb7a8c371a
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of a link farm pointing to multiple external PDF files, some hosted on compromised CMS upload directories, suggests an attempt to redirect users to malicious content or phishing sites. The primary attack vector is likely spearphishing attachment, with the PDF acting as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://artistprasanna.com/userfiles/file/vawux.pdf In PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/zopanewixetutopudebow.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/bageguxedifibogigumoxisep.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/96508312484.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/1315442257.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/86274646663.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265052f91c---tuxovasufakonixusuvat.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/wagutul.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/85183387397.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kd2teu4hnrf6p18hmcfvm52atj/dorevunikaxitadedefesevu.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/sigatujusupekiganipigaluf.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/momizur.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/knvnfs97k1mlj34ieco9v9d7s9/50671591292.pdfIn PDF document text
    • http://waypl.pl/upload/File/fusozividifevujekibema.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b332798305---40815463543.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/48067889167.pdfIn PDF document text
    • http://rococosofa.com/files/files/mafirinoxekajibasiropeb.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2aa6348b---jijiko.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161343ae77e66f---pajuwepegufapupefezoke.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/56132613307.pdfIn PDF document text
    • https://capecoralliving.com/media/file/dakuxefarakuveg.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/zajopejezedoteterovutat.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/38271186397.pdfIn PDF document text
    • http://test-immo.com/file/45806960667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+mobile+games+in+androidPDF 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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10784 bytes
SHA-256: 803bad3785c2b20806a36cd5884b080d53a7f53ab8df64167590b5a8f522b926
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 18364 bytes
SHA-256: 1baf5ae1cf30d67b1a8b02a34c68f28e998edc78322680e66d96e1e4a4bdc98f

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