Malicious PDF — malware analysis report

Static analysis result for SHA-256 a480f674461650fa…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 10:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cf78f0f9d9c27fa43653a7022143eac0 SHA-1: 9b53706f45f97001e5906646ec681010c385546a SHA-256: a480f674461650fa3ed21c0e9f2fee6c26fc8c796709c85ea2bb578333dc24c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and link farm indicate an intent to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7dc3a293---tugurozux.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078c932057ba---widebopitaxaratofowoweja.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xanisafojufawisuwiripev.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2849dd90fe2ff865dc2ec725ad5467db/gavonetutiruf.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/90918408274.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/4197608004.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gikovetekanubivefurirediv.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/4bf67cde809d0f9cc43b4d502d7d2277/86178672854.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624481237.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082902dd53---xitozewiwesuminadebi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af80a510042---jelagogol.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/vabunitabesokemel.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cef429ff5---najuwav.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/fawiwasonuwobil.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8830266e69---12899307422.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mtaebr2qhhnavcp86iknqt6h82/67365802887.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c3cb49f979cbc8f26b0cf0ab70a2439c/91480935736.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/vexitufel.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f1ed6d9c96cf5451fee3d5e3b9b0e6af/konafinilidifuju.pdfIn PDF document text
    • https://lemanssrl.it/file/69261538099.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r7iasjhl3k50hf42nj4m06skis/89192284316.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d13777244---xebexinefarufutove.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/78249054591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pro+anorexia+dietsPDF 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_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 10296 bytes
SHA-256: a7a2da909cf0df433e57e8a607ce965360db2422bb72ffe5ddf8c632a1fd1e60
font_01_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16528 bytes
SHA-256: 01defe392c14d215038e6c675c8af55ff2352168a39910e927f6d26d72053d7b

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