Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad26c867021f2ac1…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 19:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9211e34a387b43e00f0b6f30bca7c4db SHA-1: 0b92928364e29db984d18a376920aacc79fa8251 SHA-256: ad26c867021f2ac1b8b35bb10165bb71d93c5a3e8421fbb28976675236004ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://irlanc.ru/uplcv?utm_term=fur+elise+notes+for+beginners+pdf PDF link annotation
    • https://europawindow.com/app/webroot/img/main_content/files/mozuwimujazaz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3ea2170d845634d32a0f1a76cd7c5c83/54823757262.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/25588861987.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/mumojivenofibezarimi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/juraninemenunir.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pesosufojulibi.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/51249562699.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cd9f6618a3d123cd1a61d3235e7340ee/xopotebesoz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb508a0fd74---95067560866.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e016f25fd69---xatejiw.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623168155.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ac916e85---gukabogodakutodo.pdfIn PDF document text
    • http://htwy.com/upload/file/86125219148.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/41156459157.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/36503418820.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tedobolafe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1863881d3e---xavuledagexizipabomafake.pdfIn PDF document text
    • http://klinok-saintp.ru/files/46310730448.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/89949589479.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/fuwunepejowufosedakalefam.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/lolunebajodidak.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ve8m3p1soddfkphfjn32qava9v/16380948998.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/69jgrrngjfmpt7c44min2o8ler/83373772207.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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10728 bytes
SHA-256: a67c26aa6130e68c17aa9dd5e01082eca693c32e94964b22ce096a335764511f
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 18680 bytes
SHA-256: 8ffdbc0b24b88af541daba360789012693c97838aa64070269e7c652ff7bd6ac

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