Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74a5aabb602b4d9…

MALICIOUS

PDF

77.8 KB Created: 2021-06-11 21:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77fc7d0a0895203b29008357d1d76e95 SHA-1: 9b2ccb8e311299897d9bca941976b81f3c93e709 SHA-256: b74a5aabb602b4d9c6e16442ef2e112967f2a57eb4775a68fc3128a6b0fbe721
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites, likely to host or redirect to malicious payloads. The presence of external URIs and link farm heuristics suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=bike+race+game+mod+apk+download PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a705d5a1697---lojojasenovibebame.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c20172e6c3f---65683619528.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4458a8d0428c23429fd5698acfe1878/40961852626.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/simude.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bi8c57cmrtfht4l6s5eofc6lkf/6115875687.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608231fcedb02---nebegasevad.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/22496224783.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9d9caf8be5d331a29876777b864c0cce/75158084923.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/44792377419.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ba889938d56---96223579853.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec777c4139---16437062424.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21cba5b71---8097943311.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/32409865501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 5420 bytes
SHA-256: 848c1a424c97ab31d182511516225bc1b1ce49b2cf512df00bab950a0ee115d4
font_02_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 11744 bytes
SHA-256: d32876fed7da6ec56aa0c7fe8fa49bde1efd180fd599ea00ceb5a73011969c61

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