Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85ea4d82da132c7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 05:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbf17a1f64d1f428738c3b9c33833b4c SHA-1: 599f700c51ff224f2c2a5f3e9268b304b02f9a88 SHA-256: c85ea4d82da132c741eefaa1358bda37604e772ab8f9d69e0825e8a887068511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://salon-urody-bellis.pl/images/file/35249014735.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1s4gcqkafsrshfbd0c9s98fqs3/70645320795.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/28390791158.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/peladapavefepegaba.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/41289192230.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613facf0ad183---kukawesujiwutozavi.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/37197674286.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/40194182759.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161414a3522925---37183987989.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/frmgeesasn5cpnat7lqmkja531/11158786547.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164c98c722---54966213027.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/77237549601.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4926682622.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/70267468125.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/46707152945.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/37485718050.pdfIn PDF document text
    • http://na3.it/misc/file/93549942505.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/3705105610.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/49980800923.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30b25ea149d8e7add14c9f1059cb7334/kupafawiwoz.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138398d544---73432828497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=el+horrible+sue%C3%B1o+de+harriet+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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 20360 bytes
SHA-256: 4ddd0cedd62731b1e50765bb8f74f2f098a55cb8046737879c1308bca9ec8172
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 10920 bytes
SHA-256: a1e65697937c1f4418db11733f4c04879476e1c476883974aee4d1db2ae26517

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