Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fe00f5c359eb1b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 04:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6611e71980d7f98eb908b74aae760f90 SHA-1: 1c729772e44ccb42e7956b9b68b47da3c354e130 SHA-256: 39fe00f5c359eb1b218572512bf8165627436a15f4841807ea0177cc30ef04ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4d1f3bcb2---44489058500.pdf In PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/48761381839.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/81758345533.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kagetajowonavelubudutivar.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/matew.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/fepixirewit.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/teketulorur.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/72435161056.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf751b039---nomixonufobudoxovax.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6e8c9ae2---14311991148.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/temumedazejove.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070144a05055---17490818258.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/48021605106.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3db63366d.pdfIn PDF document text
    • https://faprosid.com/file/wikaremuruwa.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210808032417.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e83f7bd97---wiwiwabo.pdfIn PDF document text
    • http://ty-int.com/files/files/23957171621.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/xetiguzemelosej.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/doluror.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/senunovug.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/1421748671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+repair+software+free+download+full+versionPDF 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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 20108 bytes
SHA-256: 8a536648daaaea4c5a335379563400eab054f507b262820bc7996487674dc4d0
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 10744 bytes
SHA-256: 4e2e1ec4984ad174610452e30e286a068eb9d86c52cf422356dd1ca12ae858ad
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1