Malicious PDF — malware analysis report

Static analysis result for SHA-256 418763fe7af6c3a5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 04:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d7086596686d4a6915191fe42b3337c SHA-1: d996a77d0286dc45abe4d6590dd5282ea55fd6c3 SHA-256: 418763fe7af6c3a5e1551e027d6a8d253db318667354111104b779a828863002
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ed2f116cce4deb93216c1beaa6569e8/wikoz.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f4997548de17cc23ac5dcfa7ef93f570/visefonemapogox.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/towun.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc305d45dc---39173098493.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/negapatevowizokuxezipiwoj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/cgt3nkij4c0hsmmg4rem32foq2/87968949675.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/sogil.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sukiluk.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d63223ae8f8b2fac4b28ad0fd44f866a/mitatir.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/78328782091.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vojovoxepikazuw.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/am8tq8cpofrlvl880uq51smagb/70849989857.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e032f9cbdb25163fb516e0f3751cd2ae/62979261996.pdfIn PDF document text
    • http://slsnn.ru/content/file/14410943584.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/57344273414.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/66082124534.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff85d0aa65---kusotolokusawukulorune.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113a1c9c993e---rezigodapawekisobaneja.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50212207559.pdfIn PDF document text
    • http://dogable.de/userfiles/file/kolanowiso.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zotazejudorasurulogev.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/sapet.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef985aa6e7---mekizaxubiwetemigofuxubob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+get+exp+share+in+pokemon+emeraldPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 11324 bytes
SHA-256: fbbd4c15d4cfb0340ac43830ec8025f74a02f26f728a33fa8819f8d05410f3e0
font_02_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 20052 bytes
SHA-256: d53c2ce5f4046332003dd8c817a74a93921e2fcc3e615dbf5742114b481f2c5d

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