Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03676d050846fce…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 00:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ee64bbf3bd411673be33a2322e2bf83 SHA-1: f359cb97940a34fe839bb3c872d9dd211a9e3671 SHA-256: c03676d050846fcefead1e82a6fc87b111014e604dcdeca466ff1eec3c772aac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm likely used for phishing or SEO abuse. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=what+is+the+denotation+of+the+word+greasy PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e09a3dbd3---97927240023.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/26909708472.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/golifetopedabusobipulaw.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/xovamaxotubozuzezefolij.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xonij.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/ralewupebetenidulipet.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/87531207205.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/299490dcf121162c350525cfdf9af797/39904352711.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9dc745e6ca3b6be56cf1e4ea571cca98/17111799438.pdfIn PDF document text
    • http://chromatographvials.com/d/files/lotaniware.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/76830403499.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/1176548120.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vewizunotezorigetikikemep.pdfIn PDF document text
    • http://mayjack.com/upload/files/dusuzitiraromadu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01575caed---62904740591.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jajuvupafarowiwegoz.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/44680128183.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b723be420f---tovedudo.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddbf89f13---82460460537.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d629f9e5---pigarapafovemepufisakaf.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210627/file/46653807157.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cda0dfb210d---letipusujateded.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/68835490254.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 10780 bytes
SHA-256: b20eac92f637cad1c56eb6cbef7a6b71130dd19c09673c80c2674665af6979d2
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 20020 bytes
SHA-256: d870041303738ed109eb0eef543daa437b2a98b093e96f7101a88aad69772c7d

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