Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c4fbbaaef9965d…

MALICIOUS

PDF

105.6 KB Created: 2021-07-01 21:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f66120cae9fe3c5c44dcfccf623d039a SHA-1: f2504ad664d24ed0dc401a202ab48cc550e66c47 SHA-256: c5c4fbbaaef9965dc0f947d978b98530da3b419dbddeadaef8280a1121ddc9e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40db94775---3524425348.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cc28dc8c38e4219f725362f0f9c7095/88812600338.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7ae2e74a---wosevefubenovano.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rosifaxogejite.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c26a295e07b4e1a683df0777ed7f048f/69835916580.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8729c20e4---sulanovewokevegodol.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162264755833.pdfIn PDF document text
    • https://europartner2.pl/uploads/69738507357.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c5304e088df6c141a07c5d4fc9f4ce52/domogop.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dd9612f01580e41b1d2b86413db98c19/dusivogafikufinaj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vu3r8ssq4cr6o7uedgmhqhhbj7/90885031905.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf28a97ac---vudogexijijubalebafetasax.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/96499945668.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a72f552b097a93bdc25f658fe151c0fd/tuditodumaz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/97654800244.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gamipomonuminawujemisit.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tepir.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/govejededu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7202733895.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/l9hfitbniahkjl17pme05ob158/38433383763.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/dce706bfa4eeb480eceea4605ae876b6/movifebewogi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f311fc133f---84933045566.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/59293005480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=distal+radius+and+ulna+fracturePDF 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_off00013bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB0 17524 bytes
SHA-256: 8e437d10b96ff84e7c144cbe0915f011433e08281e051ba505e0fff2192e2ddf
font_01_sfnt_off00016988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16988 10448 bytes
SHA-256: 316d75a373380a63cb95d998b223ba2501ceeb7f0b106c7ad82cda034c888aca
font_02_sfnt_off0001815f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1815F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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