Malicious PDF — malware analysis report

Static analysis result for SHA-256 7069846b3460848c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 14:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc24f7fb60c7d6a7ab3669e83fbd6849 SHA-1: 31a1aa330d53401d6c3ec8ab091657fe4af15f1a SHA-256: 7069846b3460848cb22fa0622eab9d6fd036c169257e6d2f94384b245e59e44a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ist-lb1.istanajp.com/contents/files/36047790779.pdf In PDF document text
    • http://sns.hu/_user/file/kavusapu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bovapupo.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/78424252744.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/77519396975.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e392df20f1---77791830627.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wukizugijudoz.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/36478545066.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371f5046396---wutisatomebuxaperira.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/bofej.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/tumenikijizojuxefoweniji.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kalodenedupizamaposoku.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/79261220787.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/6975956537.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/86881412921.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/42640798590.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffa59e659---23453885325.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/kurorixelotagoxonimivomu.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/56040737314.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jewodufabupif.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/ruleworubupep.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/29112625635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=helicopter+in+gta+san+andreas+cheatPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 21228 bytes
SHA-256: b8eba2325af19a0e73460c134adf46ce8282f6b7c4bb212b03b76a2034d5a2ed
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10784 bytes
SHA-256: 2481231c487ce489a3882203565395b7c47d37bff67c11655bee3800ca95d968
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1