Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03d3aeb2de537f1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 13:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd2a3252f3c7584f95117b1de26f9bc4 SHA-1: 3436856c3801b8e3b29bee05654f0580e360d3d4 SHA-256: e03d3aeb2de537f1d75fb2bba7dffae0e68c23308f7098b2383bcec05b8d9318
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to potentially compromised websites and hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aircond.md/upload_fck/file/6956558442.pdf In PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/sosemukadenuzomul.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/995083a46683cd5c5fb65bbebef36b02/nukogisupawe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ec6a8c35---37786660264.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/vefan.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b92c6fdcd---76705128522.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vofezimugejij.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630281224/files/boduwirob.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b149de12e3---66536090760.pdfIn PDF document text
    • https://alutat.com/data/file/84065677402.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/24015999263.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5d2dccf7cc7ad8f391b05425d422878f/34140513769.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/91015710786.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/65166877855.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ed59e54afa6e1576dd3167d570b9354e/nedana.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d36ec23f75---35424326768.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/dajokejerazipowanokivijo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee4645d83---jujoxazerosepuzapupasoma.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052503172273499.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79356479364.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/guruwowemupitogateralub.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/95868090797.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/53300156414.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2276fbc6---40613746429.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a8ee2eb5---mapemevuzudelojuwulejas.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/lonalemiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=conversion+of+pdf+to+word+file+onlinePDF 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_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 10512 bytes
SHA-256: bfa7ec05af18e7aaabb1d4c9ba655165e3c7fa9a937d1eeb855193d58521ab5a
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 17988 bytes
SHA-256: 950efb5bbf1dbd9f61705254de3a7198ee05d76eaf9f954e2eab8f9eb538ad6e