Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ab3d8af74f75bb…

MALICIOUS

PDF

94.4 KB Created: 2021-09-02 13:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 786e2b8970751fc11766774a691ff288 SHA-1: 74d5eee8b086d8c55cdc95cb67a3719aaba0ee89 SHA-256: 44ab3d8af74f75bb958b298eb2c31c60d35a00c7e057ce0e5dc6eae0ec2de1f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=the+meiteis+pdf PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/56c7349f724bd8d83af36468bde1a798/zaxebawariniveg.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/78774911403.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/9pudb5tdtpc51hc4gkeohikqgr/tixidaj.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a04da30fb4e9b251d0ea6f7635ab4351/94905800106.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f43f6a51e---77624424268.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5187200927a879f67ec4d9b9b6285628/90658761233.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/85673574871.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/sixolusorodabodopo.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c121b9764cb---11810077001.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/konibepa.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/76813615121.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8f08e3aed722bf023ab16169bb9da82/6439177954.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dpd39mp8n1ddmoe3tksjm4ordq/51102697415.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/18559789021.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/30754096824.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/mukivufozupajokuseduneka.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/65150881064.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110dbbebb49---renerujutowezetetabepot.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e88e1375---ginosekupiruvikiselutojox.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/84705172041.pdfIn PDF document text
    • http://limoride.net/gallery/file/3714916787.pdfIn PDF document text
    • http://bscartridge.com/pic/pijawew.pdfIn PDF document text
    • http://nemalipics.com/sukimekarunodajimuzuwi.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608caca21c7ea---goravaz.pdfIn PDF document text
    • 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_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 20084 bytes
SHA-256: a5982aa5a08361ce70660a569518f28d49c9338df56c4307e601785a0fe5ce86
font_01_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 10196 bytes
SHA-256: 73299b9876c2a264370ebf13774611bd1644bc39ab9b52fcc42febb5ef4300f3
font_02_sfnt_off000153bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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