Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1ce345122beeb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 06:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8560541aa18a4791e5457b44a689385 SHA-1: 42b5c9a47e9ae1ed4750eb2a55ad917b0eb5205b SHA-256: 7af1ce345122beeb3ac162f5baa2fd8d646e5f1ead78381cca91068a59571038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to websites hosted on compromised CMS platforms, specifically WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/32b5729e10ddee36686bd8a8b03cf2dd/28135520055.pdf In PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/gipanapixogakozinivowa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b6e9e1eb8ff1a11a152f302cf76e691a/52845226102.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/jixepebiloluwoxig.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/23992592545.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/152065173261397946cf453.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/jutuduvadi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wanuxapinip.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0e85e44f6996ee26f557b7e8a4afe69b/49280335671.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/89695695386.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dejujujepu.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/68999093442.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909094134.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bigezitotubuje.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/pabokizerujizotanipusud.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/70472102792.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35416223941.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/35616905212.pdfIn PDF document text
    • https://topxbestlist.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tamilyogi+fm+2019PDF 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_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 10492 bytes
SHA-256: 186b3f96d51be171057f548a6cb9ef0a73dd3371bd5746438c099b88448f7677
font_01_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16392 bytes
SHA-256: 6b83762b3fcf50f915bbd191163962a2399b63bcfbc750eedcb311d832cfe0fd