Malicious PDF — malware analysis report

Static analysis result for SHA-256 10078223ec86e898…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 02:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29940d19f7265ed9c5a7846810d58ab7 SHA-1: c0bec185b84c79cd255c387b693d4b685102f8d4 SHA-256: 10078223ec86e89848331be7bf7f7d7f904e9594e399233f914bc5ebebc627b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca6194b5---fekedevizenasakok.pdf In PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/55559533278.pdfIn PDF document text
    • http://7profi.net/userfiles/file/22279136173.pdfIn PDF document text
    • https://haidangpc.com/contents/files/89863600681.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/devudijuwodajavubipifofaf.pdfIn PDF document text
    • http://lactopad.com/uploads/files/19915944886.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/lobarelakutap.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/megesubegoma.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/53425801227.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/88657339843.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/92140361047.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/boberojaduf.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/pixivakefowowupuvejugox.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f42b807---baboxifat.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c61fbaa85d234bb940182c4d549b4e34/dafogajuwuwu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7cca3b9c---74793748742.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/modat.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/kegefelizozinujowofel.pdfIn PDF document text
    • http://sieuthibds.net/images/files/77663147640.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/3941692066.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/witujoritedabuzotatewa.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/vorodiwugurijedanewiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wonder+woman+1984+full+movie+free+downloadPDF 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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11000 bytes
SHA-256: 542d1311860721aa5ce7feb8eddfd0e9328c8d889eee45cdf2aac4830906eb7c
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 17220 bytes
SHA-256: 3ec008043cf55d16e5c1b9e5f88ac4eeea9d30f2bbf0dc432e22128d521e0034