Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc5ffd5367805c…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 05:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a196cca6ec4d9a2e6317f15ccf85b984 SHA-1: 4e1d39f6f6fc7be8b00af92823a2e206a913c738 SHA-256: 66cc5ffd5367805c0d250ca798b9efae9afebdd8cda64af50f90b3b936732fd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates potential for further malicious actions, such as downloading secondary payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crewmak.ru/uplcv?utm_term=pull+off+definition PDF link annotation
    • http://chekeeh.ir/basefile/chekeehir/files/genapidetovudoxadefo.pdfIn PDF document text
    • http://chinalabware.net/d/files/68419701865.pdfIn PDF document text
    • https://geloracinta.com/contents/files/fakimilapuba.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/43265533487.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/1379782970.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/79137331754.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/56506774761.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c698154e98---jiduvenomibu.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/torogi.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/18866307108.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/25686002068.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/58216949315.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/vetipalat.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/sabajurazimovuner.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d80b3fcdc---jimetubo.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/60243716944.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/42815764584.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109020503121488.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/39927774312.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t40l4d8opocnq13auhq5dum9r1/14456942347.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/fofidoren.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/98353395771.pdfIn PDF document text
    • http://clubblink.net/admin/upload/file/98537916490.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/69873960039.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/4157757580.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/waziduwojukumun.pdfIn PDF document text
    • 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 10020 bytes
SHA-256: 95eeabbc731d362a98e0df760462e114d57ba649b0a4a211215977aac0a9600d
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 14652 bytes
SHA-256: 89fcc9075c0562b4c61c7f9cd43976c82141436efeffea72119ffac84fb09cc9
font_02_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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