Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fb929b2d0c59d9…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 17:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a44ea9070aecff0df32d720308b092d SHA-1: ea95930cce081a5c0857c49c428fce7e9b3caec8 SHA-256: e7fb929b2d0c59d962801b295b9f6a37ea9a971ab28aa32983414ec62b52d22d
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://drafthe.ru/uplcv?utm_term=how+to+change+pdf+orientation+and+save PDF link annotation
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c613e1aaab7---69692512338.pdfIn PDF document text
    • http://scro.ru/pic/file/33224219040.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/11936406122.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/60219465168.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fa7d4794aa0d98064983bf73afe3fd03/9136219329.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f175c0b5---makuvewemikilewugusi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ncrjo2sci227ugac02j4tdhbg6/kovoteva.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/7066381617.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfce70fa2---wegidilop.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/pabozumu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c5835feb14b5bc36afe13587ceb9723c/37662082956.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b2a10f42---rapubi.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/55026099150.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/sepotizujinigoxidef.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3908754870.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j85i7513un3kd1mauq4afj71aa/bujirub.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/dadotabenuwepesogosewoka.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/92883771825.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d70a82a597cc7c71196d39c79f8fa9c2/bujesazuzun.pdfIn PDF document text
    • https://aedwea.com/upload/foto/19496556373.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/67075f252cc5c36554f3b4dc68b825d2/zomazenitirixuzalitog.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zemuzelunataxexud.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3235fa0d03---30579063841.pdfIn PDF document text
    • 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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 17640 bytes
SHA-256: 3c08b5547cb862a4f8cf9999e1e57b4e01df759ff8047cd970272804e8cd2f02
font_01_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 10996 bytes
SHA-256: a12279e4ea82c03e337e995af8f03200798b8d1f0f60482fc8130dd40cabbf00

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