Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebecb444474d0c75…

MALICIOUS

PDF

89.3 KB Created: 2021-08-01 19:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95ff34e318505f5fc91c6f9c00b4c8d9 SHA-1: 334aa9b33cf3f2463e9efa56911f5269f8336cfd SHA-256: ebecb444474d0c755ce77aa5f60129973b9f8253b7d571b6ea509094de8512f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8539bdf1631b8d88767253b0a24a06a8/zomedakimewe.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6edd62043d6903989399ecd0c45695c5/fosulevivupapigewif.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nobilufimerovipizipo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785053141---pufow.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zurufuwijunojonona.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c7edcd7e7e3ef6f017b2825483eea7b3/bipomiro.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f021d4b1e0---nodigagosuguw.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/41425102828.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b04b09d0---jesijivi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080977aaac3d---pikeji.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6375e599f2504689e1e9adc97f293331/fimeken.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b859de5313d673c4bd586d7c29151c5b/86254874313.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/82609223345.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3148bce2eb---fanumujujoguwizutafi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tanag.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/72703132565.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/nafopenomezi.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/timake.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/3143234831.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nasunugofuvukedusonosu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/doa3v3koga1fs3hpli5u06bms1/xaliwiritexisoromitepenot.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1d7e742---5505807647.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7246486563---sadujakujuzubilujuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tv+tropes+bob%27s+burgers+charactersPDF 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_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 17800 bytes
SHA-256: 7606251cfc110ba1322017d62758753fc7d31c0a70f82543a658cc923d2a1238
font_01_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E13 10712 bytes
SHA-256: 262e40e0d804b2a1a1a6c554d1e83ad282ad4d442a28efa37a0a4decddec68a2

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