Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea32c35911213134…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 08:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44c84860a8ee5c415ab107dc8c844b1f SHA-1: e02028dd6e78a0f140b473de7afe66ab9a246a6f SHA-256: ea32c35911213134d915f0dab01bb8ec29968bc387409c2a473c1bc515027536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the presence of link farms and compromised upload storage, suggesting the PDF's primary purpose is to direct users to malicious external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://812423.qqtogeljackpot2.com/contents/files/zewefewolodaf.pdf In PDF document text
    • http://ustunongel.com/image/files/xerivibasusumebilevuwijuk.pdfIn PDF document text
    • https://loctra.net/userfiles/file/23761163327.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/tivirepuvasuresugowatob.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/porelizasud.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pufafexisal.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/wumonewexegaxuluti.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0bc9ad63---58551599932.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef9aa2e19---45412213388.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/madima.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/nafaj.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/wakemomofadamu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66352265452.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/tasezekegokurejovezofus.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/32745363276.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/39390055650.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/kinixudamavek.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/bapojudegese.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/ligelefideza.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nokijat.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xotubopakexemipoj.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/48168065094.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db45a9efaa---74318138650.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/72565905906.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/41165667903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nelson+physics+11+university+preparation+pdfPDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 11024 bytes
SHA-256: d4cd5049ec6ed3d7a085e3aa07871ae0b640ef5df7167d907a4882333dcc0204
font_02_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 16552 bytes
SHA-256: 33b08fcd8de03414df919d197581b6cf7e9cc455cfe7b322523c92375f5d6f4f

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