Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa60406721a13f0…

MALICIOUS

PDF

68.7 KB Created: 2021-05-15 05:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dced1299336245d39d00bd28616750a SHA-1: e8f0f9733750abe6fce1e3cc8220ef121594ba48 SHA-256: 5fa60406721a13f0fe89efe30d2bdba865d35f2fd85578bfb8fecad786597e78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8250df6e---jilejiwat.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880331e3674---negidunasolunaronej.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608824e90b938---49731889892.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7434d47ae3a9892617c0b9b886b9504a/9335359558.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb9694484---69215200271.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d7dcdc30---81698793202.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160703ffc42da6---vonupexefofarotowiwogazad.pdf
    • https://akproauto.com/nbloom/fckuploads/file/3040980228.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099413cc68f5---xanalujamezowide.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607188531a858---42169488169.pdf
    • http://asokmontridental.com/userfiles/file/62992675282.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862ab77653b---diwidowej.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9cb56d8b---wezinetatimuzokanato.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/784f86e3227702259740851245824b49/42892443683.pdf
    • http://matstravel.ru/userfiles/file/maxunuwiwoletunapep.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f52d3ce7---42085462100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=iti+electrician+answer+key+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e0.bin
2f66cbaae6c6b3647c03760da2144b5372ea58a4a16840363c26b232f1b6f003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 5472 bytes
font_01_sfnt_off0000e69f.bin
fcb31f6b9de00bba14ba7ee281899e7be1c33c9d29baf391efab97c7adbfb621		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 10932 bytes

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