Malicious PDF — malware analysis report

Static analysis result for SHA-256 046d77bc92cd52d4…

MALICIOUS

PDF

74.1 KB Created: 2021-06-20 17:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc5ebaba0b996fa964daaa20df6dd909 SHA-1: fe26f0e03375ead1626b9c3ddf9627b80382d8bb SHA-256: 046d77bc92cd52d4fd15f1c2d8236f854813823bf1cfcd3c2dbcb8bbba9fae97
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gw21.ch/uploads/userfiles/file/xosorafabinudelu.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc018b3a9---towasofonakiwazilipo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gixosoxojimatubitujugi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/4347482511.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/78995534211.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9fe8363---23330292855.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506221634673453.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0c88209e---disavez.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/78122ef38341fbd774a984985aed0364/zasowisakuxew.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/65047480880.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nanavulelugorifuk.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/seximomaz.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/nobinije.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a08eb972b---rebigagabonamutopebixejoz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a44d3107a8---12719648631.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/29552043285.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6d85a962---33552267694.pdfIn PDF document text
    • http://gdaniec.com/upload/files/tifaporinezusuzivubus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lego+the+hobbit+red+brick+codesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 5104 bytes
SHA-256: 5675cbf73ed6b858bf4d67bb36a429a472390e9b151e6b602e3e480a13d6c57a
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11484 bytes
SHA-256: 1fca348e767a3dbedac0953425a498dfe8d24e17adb05535a52b6380267c18aa