Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5a52b25f3d57b3…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 02:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96f2c9e61dab31895a3f7846d2c85ba3 SHA-1: 8505974c39af87adf1b5154dc6293cd3940c13b7 SHA-256: 4d5a52b25f3d57b3d8785af8af895610b7f5c1c4efc8e993b635bd4bc9489299
204 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains numerous links to potentially compromised websites, suggesting a link farm or distribution network. The document also contains an instruction to disable security software, a critical indicator of malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kapqagavk5n5vjo6jgrqjioq42/dilaxawawevabavedujesud.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f31f0141ef9---7578441519.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/38733416231.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/30105495225.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5894f53a2c---vexam.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/buwudefifukewoxaxuretogot.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/52872059364.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/69156377299.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/54385cc10a637a02305f93cf411aecb7/82252747259.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/wovofamadoju.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/13785489674.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7f0a48c0---poxudawogo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vizatuz.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/piwinujizosopevipobazuze.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jajinikupi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/663b6b66b2631b5bb4e6be06c889e45a/ragozejomu.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/zefoj.pdfIn PDF document text
    • http://myqself.com/upload/files/dugasigojagi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a30d90614b980b3becd3ebc94e47bfaa/57970892422.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/16776413907.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/91510377739.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091b514a46e9---26130145604.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddbbc49ac---27229243584.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cedd0f5c---79369326333.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04954f53d95925f59a242affe584593c/40161932316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+fnaf+sister+location+for+freePDF 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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 18432 bytes
SHA-256: 85991747c6de20272eb9d45712600e6a8bd30dce2d2f8516c433c63e76e6e277
font_01_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 10548 bytes
SHA-256: a56ff4bc1d4ca4daed0959297008f0f76331a01ffd05d3b27650a2ea751f53e9

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