Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdac3ffba42becc7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 22:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75458ff4d06964ef5cdeb9b77a5cd1ff SHA-1: 7b13a2e02167d282f225e24e0fff7eb2cf4fcf88 SHA-256: cdac3ffba42becc7cd5827f579a6011766fbf629ea38061331fe32545cf2b6e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613573a92da39---65086673959.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/147db764f3d18d353400ad4b1b44c037/lekozafewewebekowevilewep.pdfIn PDF document text
    • http://podarox.ru/public/files/dexazegerirojo.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/2078181135.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/roguvo.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/89752336696.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sujimifizipoxorulokuwow.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f558ab7c79---sikevajagafaramixe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec6ad65f16a54eca7b9ce49d2ab48f36/30660234493.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/jajutosekegonoxagizenixo.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/26866693989.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/00be16ce8b0ebf7a5146ae016c19abe5/73541501353.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/88243604868.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/popavixulexe.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/60400338954.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/nisedubaduni.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xezetumanapaponulodimewe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e35782f7---sofenigikigupepizunepux.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/75524778805.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/sabifukup.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae9436c39---vuteki.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/muvajubaparexinames.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+complete+tightwad+gazette+pdf+free+downloadPDF 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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 17548 bytes
SHA-256: 00851b5ca7072d17c1b5eb3f7f5f3f2939261b92530a0161e8a06a69050ceb13
font_02_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 11008 bytes
SHA-256: 2b2dffaf30f27f8f4ac9f930b8a287a9d258049b5d50cf2b4e37bf72bae02166

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