Malicious PDF — malware analysis report

Static analysis result for SHA-256 423572255d01b6ed…

MALICIOUS

PDF

85.6 KB Created: 2021-08-11 17:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b48cb64bb66d88a05529b25f64c1d4b5 SHA-1: 63bf3f23657494dea1ca6a237e79819046ad46e7 SHA-256: 423572255d01b6ede3b909288cfdc394560a1abd2f2edc451bcddb5e6ec14d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://ketchas.ru/uplcv?utm_term=the+legend+of+zelda+breath+of+the+wild+2+new+trailer PDF link annotation
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/rosulobagukenigeroxa.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070522ea0f09---33512322122.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1182b5b38---bebujodada.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/27644972346.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/230088ff9b0e75e9b667b08809d51f45/vavewumuxewoxabodenedosot.pdfIn PDF document text
    • http://www.toptehnik.si/images/xutonukudax.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/bipizujifadenobitiwej.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vibobenilaxin.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/xenuzefodutoxerode.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb4b01ee7---vevugotikawemu.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/15038025710.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/52783313991.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/90997367055.pdfIn PDF document text
    • http://aps-mes.com/files/file/41289929899.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/b04uec2m4l0nqp7sdngeio4i01/47485928902.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/5156756580.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7o8kbp6dmdusjplllt5l81ihlg/52811991619.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/dco0nt3ljg3vt1d7mv8rad7svb/rukokeburasofu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kqfq7cle397ksg295tk3cnb3rm/88080224812.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/61051243926.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a8ece27a4761f3e9fec5c75c19bb787f/84762296651.pdfIn 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://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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 19896 bytes
SHA-256: 91c8ce05414e26746ed72096dd93c2f6b75b3c7176436f549a21079db469f86c
font_01_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 10832 bytes
SHA-256: 5d5405f83573a61f9577fa84b7d171b33627576a388ae0ce381ff86dc8405bbf
font_02_sfnt_off00012f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1