Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926d31c7389deca…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 16:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c7a2d1e5c041e838334acd222da154f SHA-1: ffd0f62b4cefe744367c274dc7f00c8fa374ec68 SHA-256: 1926d31c7389deca949bd076afbaf56e4db099f989d5a20f10ccc49720832cdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains multiple links to potentially compromised websites, including one pointing to a PDF hosted on a WordPress upload directory. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of external links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • 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://pc-driver.ru/userfiles/files/zupusak.pdf In PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/11069697992.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133320f41dcb---95807862452.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/sikafir.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/zosuwupajuvoximagivume.pdfIn PDF document text
    • http://classtool.info/upload/files/volenetasumelotobad.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/7902815323.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xeburibuxajuf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133eec5a4b2c---68490139571.pdfIn PDF document text
    • http://tfforming.ru/d/files/95370399950.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/48203142145.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3866a2c1d9a47614954c375e97f79e06/mujiwomi.pdfIn PDF document text
    • http://co-mit.com/uploads/files/49636636986.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58552849375.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/bosefeze.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/subavi.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/wemudixofuwolavufedusaxog.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/79363644502.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/6855329780.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/debovamasabaxevo.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/65752519232.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/76836794323.pdfIn PDF document text
    • http://dsraxys.com/uploads/fusalimadefiralo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/zisutimudufegitolufo.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/pebazufizolumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+change+lock+screen+on+android+phonePDF 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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 10960 bytes
SHA-256: 2ca0464294e72e3001b2e4462d82f431a9eea97ed8dddf6981df8f1f83950c27
font_01_sfnt_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 16388 bytes
SHA-256: d07347b63c3ec0d281cf16eb6fc18bc634813a1af66e9199da05faaaca17e10f

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