Malicious PDF — malware analysis report

Static analysis result for SHA-256 45421164b56c7e3f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-14 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 806f8f5001b7bf3fb9c8274a0fd5790d SHA-1: 6f4d1797682129fafa1833c127394f7fc59dd36a SHA-256: 45421164b56c7e3f9f84fa4b53e6eba6ee70a13e36b643e28aff9a640262d823
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including embedded JavaScript and links to compromised websites, suggesting an attempt to deliver a payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seattleteriyaki3.com/uploads/files/52570984036.pdf In PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/15410053466.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zamidu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26b7f95e09037080d5a25349ec6479ad/60365329170.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/10453429422.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/95777224984.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/gituzikodowuwepafesez.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/xexugurexu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308248cadb2---bavuv.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/73783681001.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138472106b16---xinulesowi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c14475852---61649736968.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/66058485927.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vedoxegebaripimixagufuf.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/98776322157.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/15497969935.pdfIn PDF document text
    • http://flomojapan.com/upload/files/piteradi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/xutol.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45758287604.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/25779569650.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/pejupotakipawerupaduse.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911163831.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631505739867690287.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005da8feb8---5697097897.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/80844406185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=find+wifi+password+saved+on+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_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 15876 bytes
SHA-256: 6ef8a5aeaf5684831940645c0352fae3f8ceed9744d64f8d257cc2016e1a6ab3
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 10476 bytes
SHA-256: ca63b2047d9086c7109fa0c8adc6b2e16bc63cc96099fc928f8df28a151e5a77
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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