Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68dfe7127b1cdb6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 02:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 974c2cd18bfbe00ddb80ee8528369ee3 SHA-1: ea48fa6f97618d480923158ebdd24a67f9c0c379 SHA-256: d68dfe7127b1cdb6fc8bb3f1739eaec1e15b83e8b5c040f73a40938003880632
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rosg.net/sa_upload/userfiles/file/20210919060304.pdf In PDF document text
    • http://srtprogetti.eu/userfiles/files/gibobi.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/55003982355.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/zutevugejilarowibix.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/gaxagijajugeva.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/tugamojolofirapepevute.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/fumagusefetuba.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/99160423204.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/jevudux.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/49134747476.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee746c61b8---80088280756.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/duxaluwok.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/pisuroje.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/dazivejiluzejot.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/joxadorafumun.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37216856114.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/iikqminfrim8taeervoq4cf692/xazukazevezikafef.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/4389885908.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2aso58c268ssthdlvbsmuhrnk6/savaxifotizolaru.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/zefoge.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1671761419.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161465c2186b33---batalonuxulabomu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210917231417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=internet+explorer+7+for+android+apkPDF 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 21700 bytes
SHA-256: ee3d402ff83f94be1dd25ccae711cee14cf5414e618c3d2b34b8c6d1a7b35064
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 10516 bytes
SHA-256: 24c05fc56376640e1553ce36ddec40ca26354adadf76c17c9f398957a4598b5d

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