Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c06e4aceed2d5d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 00:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 040e48928dd440e7b41125853f6b88f3 SHA-1: ca5909cce387530388dfc4b79eec114a2dd6dcfc SHA-256: 44c06e4aceed2d5d1f68d14f6daea4950d71e134935c7863cd594af7b11b0377
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farms indicates a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa02e7605---makasewafosadune.pdf In PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/8229420151.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6f2c532ad43a3d43692e5de5bd0f21bb/favukenejikipimubenozu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ep8gagpbtlmp4rnu8pe0fk5jek/16972562811.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/82857429402.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/xedimaxeruxutidozasuti.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/taderopowowujopetemolo.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/bobapenarawelobanivupa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b594b224666d2dc8c6272331a251ea5/wovelini.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/bufovatodeje.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/tejologisupuzadigibofop.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90eebb79b2---6308501401.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/22849177937.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/26df99a5b1ae01d7b9cc175c791ca95e/6369495668.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/32980607953.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tamoboseveminuwumefupufax.pdfIn PDF document text
    • http://195exim.com/datas/files/83922704038.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/xolovosulode.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///ditejiniteromudu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d042ecf99---zuwikaxobe.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/13215082987.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/41805551249.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba504a15f15---selaluxabikugevogonibaxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=inches+to+centimeters+conversion+chart+pdfPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10856 bytes
SHA-256: 78a00e726ae13394f1806970ab6a8e0a1ed0da67f7ac41f817e205a7b1c5118e
font_02_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16744 bytes
SHA-256: 20bb66ded2993a2a5afc89d58547ea37c4887ef80109afc582abf6a6b7f2efb5

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