Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1305dd28db1c3e…

MALICIOUS

PDF

94.7 KB Created: 2021-09-04 08:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85c8e48002a08ffef2be727c43dba238 SHA-1: 3626824692228cd320ef166fc34003206197c9e2 SHA-256: fe1305dd28db1c3e88af672598975a8013ecdab0da1985dfe00b19bdba8bc0e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abwingssuffolk2.com/uploads/files/87160560042.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ae5207a8---mumuvijasazejixuk.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/dorajisux.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210807135513.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/66930527825.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/32407278650.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/94120701600.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b68499619---58898660226.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/65227587083.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210616_E2E3C92186E683E8.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/5201420105.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d996656d590---winemurakejimatokin.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/9658888936.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160898e4de278f---86556502508.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sapuribosafajuxawewukusut.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/jimexukekaxibiwasej.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/sufisegoxeponipobuwiretab.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/vudasaxegi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffffd022f70---relefubopojiviw.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f3b44b750---38689096634.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d98e8465---59638801394.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733de9e126f---vabasid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cuidados+de+enfermeria+en+pacientes+con+lupus+eritematoso+sistemico+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_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 20920 bytes
SHA-256: 4ec4ec8633c3d86a96e3f3ae6248a4cf3f9509b6a9020c52e03688056886f23f
font_02_sfnt_off00015324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15324 10912 bytes
SHA-256: b8d55ee5e81bcc743024d0ea0e0e2a20f50d75866713b8b3899a4ba5e4edeeef

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