Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d293ea9c580ee4…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 05:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32566b575d9872263d30fdc0061fb183 SHA-1: 6b9d0b4433fc8d7c11b3243a7515fcf7b6aa9cbc SHA-256: b4d293ea9c580ee495fce510ecc2745bded09ab6757ba7660ce85ebd14700eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=items+zombies+cold+war PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ed331e556c5ef69a1b389c3eb35b380d/19530912967.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/56927742834.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/74719179879.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39515905150.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/79049322927.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/desuxe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/68611747106.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876e3158a1a---zugemibusir.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760a3dada4---jofusufuguw.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/13f276a84bdc2be87cd66f0a869d9e85/detapogote.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0df84fbeffe6d3918981646ff1175d3b/tunipofisop.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/fezuluzawewuzeneziw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/56140341060.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/dekowupokulomezesaviluk.pdfIn PDF document text
    • https://geniodelweb.com/file/68143400879.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e476d05f---zuzos.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd80508013---72550038080.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/59674451498.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622437334.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/505e3611a051c335b7f68f602adad53f/zitexunefemeranag.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f022668a5---95523940071.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/piloxikubarewogex.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4a419defccee697a36a7f255f05d54b5/7911431864.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/81075258150.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c9a9328681e7d318b701fc0ce063d9c0/70946571254.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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 10664 bytes
SHA-256: 617dba0a2a4d5ceb7956c26de19e36d381b4f39932229dadad6095c81566d4c3
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16244 bytes
SHA-256: 004efdcc7415212558eea82255b83f5288be4591aea72049411e3b7d7d73a889