Malicious PDF — malware analysis report

Static analysis result for SHA-256 63904e7929543b70…

MALICIOUS

PDF

97.6 KB Created: 2021-07-22 20:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c68bd7bae41201a8cff25b89445e9bfd SHA-1: c3a925dbe42de838ef0c34e2e545c2c9ff746342 SHA-256: 63904e7929543b70437ba1e166ecb85351e8709ec3a635b647f7d9d840cf5d87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the file as a potential attachment (T1566.001) are key indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://school19-zav.ru/userfiles/file/jufarew.pdf In PDF document text
    • https://vayamcs.com/content_files/files/45563744675.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/49889750521.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b1f957acc99ef6a2ac6eacfdc9555ee9/20449588024.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/varifutapavuloloriximo.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/af498774b15898f5c438230e54cb6d54/66545197006.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/lunelugejerulowevek.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1442c73905ec44edf68b0f9d35715a36/gutusuzotukukomokel.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/64336109623.pdfIn PDF document text
    • https://buyafranchise.org/files/files/20118069065.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d539a066---jivipu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3cf5cr413t2dk927qt2erg9cr9/4142685320.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/60082172832.pdfIn PDF document text
    • http://araonline.hu/uploads/file/mevotozitaxisinuve.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/30923194403.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38f0954cc---86990260815.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/bigelimiwin.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/49899c74d221d4430f0326888eb85655/wevexifefejetipaforivuve.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb6ec4fe05---45075738828.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741899cffc2---55610302691.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ale6eph0f495ffp0hjl2rtt2a4/13740978265.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/voxuxanigorara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+48+laws+of+power+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_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 17228 bytes
SHA-256: b9f14a7180a63a8999658725caf87958ff80f44507e8c39e4e2b4d505a9d8fc6
font_01_sfnt_off000145a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 10740 bytes
SHA-256: 755663cf953da011e6242c2fbb3b5d95a01a594c1d436be17fad473727a792c4
font_02_sfnt_off00015e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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