Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fdfa5d03c237d7…

MALICIOUS

PDF

179.0 KB Created: 2021-07-23 14:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5cd9fe83cb4a62e1a309592a8e9d43b9 SHA-1: 927960a0300ccf5804b373f583ab960c9e26d374 SHA-256: 91fdfa5d03c237d7330c9d5793a01c66b582d7bb7f39816d7de25a5b91ec6f80
172 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gsacademy.ge/uploads/files/pepozenuje.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mq0b3ov6fjk8ekkgvb9lqguj17/tekonud.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/zazaxukunuzogevifa.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/9306319828.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acca7772e69---1918508349.pdfIn PDF document text
    • http://mp-journal.com/media/file/71666236138.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/88745755023.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8b2vddvchicv2jejb68su38vgu/65776336943.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d868e4d8326---17265072504.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/423aff014ac91b85fe68fd27b6801507/82447582925.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb5dae87c2---munisomorubokimokesobumov.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/43152757126.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0o04ioue565he5q8a78c24kgt7/figoriditix.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hstis1gcgfa55e4ga1addrg1o0/72843390449.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8be477920c6a581f6833d6825db5c570/786413026.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/u43vf8i5p734prv6ppvfkllk8l/vuwazapinova.pdfIn PDF document text
    • https://go2germany.ru/files/file/kunefetumetomufu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gukananaz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t94ucga5p215gkjpjjbvvncrk7/53907629878.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a755e25f4c---91804970044.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff756e98b4---vevot.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dalelatakadegixoki.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b40c3918f---godovexisopupujepev.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/abb0e46ec20af02bf9ff0379fca20dcd/rijomoj.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/40155858028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+wills+eye+manual+6th+edition+pdf+downloadPDF 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_off000258f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00027109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27109 11096 bytes
SHA-256: 6d5135fe436baad3b85759f293b7d512d518426bc323f7528a2957019f076b62
font_02_sfnt_off00028ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28AD2 18712 bytes
SHA-256: a6d3d3bd7f784b79c6786e4bbf0c43a8ae9982fc10e794e12526caf866d7e33e

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