Malicious PDF — malware analysis report

Static analysis result for SHA-256 423aaca3f5ce5923…

MALICIOUS

PDF

74.9 KB Created: 2021-06-20 08:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 29af1dbc837baa78537ea4b72bbd54f5 SHA-1: 7be83e239b229adb41fdefc18adc065d08bb0d2f SHA-256: 423aaca3f5ce5923ba06fecab82cd4c1283dee602bc430a2ca0961b81e92bcfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The PDF structure and embedded links suggest an attempt to disguise malicious activity as legitimate content, potentially leading to further compromise.

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 http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093041d17c45---75017203531.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/55lh6b6k3mpoi0a8qctg8f1964/kidokazaf.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/u15d62htejdvrftr99quii7sl7/62878700812.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/388f4faf2f209e635c8e888f814b3f00/79528873123.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3ef9946d90cc1353f80fa7931568aa76/lujosovulorovesaxi.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/93268949128.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c369065d---fuxawidikezuvu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/74567c66d597b1a436e5c9ecd6c233fe/15929612366.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c4f6435f1---gilopisorevapisa.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/lesuj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2a33391e---sidazitijutaserenoxupan.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/81eb08ec7b20a3b3efb54ad8d64dd07b/setirudigepaboweduzolun.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3b1c64675---82984410896.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/PmAiG5ZyT-k/uplcv?utm_term=among+us+this+is+not+your+phone+live+wallpaperPDF 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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 5476 bytes
SHA-256: 602ba3b2c04798170aec8fc2dc92a422ad0a5dc74c74c856c28e5eee54c88298
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 11104 bytes
SHA-256: e6f6b30af3a582935d6e1d8d26cc09575349af5e9c9fd1ebe24917e60b0e6504

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