Malicious PDF — malware analysis report

Static analysis result for SHA-256 4049c2f98f78c875…

MALICIOUS

PDF

74.5 KB Created: 2021-07-02 08:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 045018293a28f6b227b96ae74fd6f55d SHA-1: 10d96121fe68c5f8d61e3f371f36c940603708c4 SHA-256: 4049c2f98f78c875fb2d37ea4f7425faad696c3d0c0422d9b81cf2a50b4ee6ea
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting sites, indicating a likely phishing or malware distribution attempt. The presence of numerous external URIs and the nature of the link farm suggest an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://zerosquareonline.com/file/30914968604.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/vifosawujiralugos.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/zalogede.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/walurotesowuzenupa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4c7c939f7e36cd699d4e986f8cdbca39/18629425258.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/26936334676.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/405da5906f1e59bd3bb3e7746f27b74d/tatepogudovazugajijefutiz.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/gogovobixalogosuronex.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/26161812142.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/5942408639.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/depimujadu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d51b7a22cdd---52701558005.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2ecc5c20---pefuwasupepabagor.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/81863300717.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/74398936595.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/535a515432f7f0b30da697bd695ebd2c/mikagumudeb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098337ab037c---genajajeratosudepimi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/50047811522.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d083b5fbb---87741646319.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dc1af798---dobafivefizimolexo.pdfIn PDF document text
    • https://biocoils.com/img/file/80994105389.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794494e61---letitulefomalanujajedalew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+called+a+group+of+horsesPDF 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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16848 bytes
SHA-256: 29c6e43d463c9d47bdef3beba097a5cc0f89f158fc378d205e68dd727f252211
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 10888 bytes
SHA-256: c430938731b11707803c9796fb3f687a5247e40b956037596872791bb4c6c4ef
font_02_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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