Malicious PDF — malware analysis report

Static analysis result for SHA-256 34522cb71e36f62a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 11:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 59930324a780aebb888fe15ab097f199 SHA-1: 6c888b913bd71cd018e79d647ab791a9b0964a9a SHA-256: 34522cb71e36f62a4d7c1e4f7669ca714aaff5f148bb548bc35f1820d6c0ff8c
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 0.9975

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=genius+hour+worksheets PDF link annotation
    • http://kommunikator.nu/demo/userfiles/file///razapanurupi.pdfIn PDF document text
    • https://landi-bg.com/images/file/woguvoboboxitude.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/porivinuwetiwaropep.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc4293c191---5144390175.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/mitubonofuvexonolulo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c934d7aa436---61221585620.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/suvavomiraxepatebedikuv.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xevipupo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a5ebcea8---dikupivebogiwowaxusag.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/83196999373.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/627334a29547ce7c442cee4b11a0b337/20230126554.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e043e266e4---25189796183.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vfjbeu8rcbtfau8rjjjpri1891/98827211219.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/favukujonepi.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/vavagi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cacb9a27---98960905883.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/63306275559.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a751df1f15a46f7e8e83ef29a0f7e32a/debubafixapotofixorabada.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d4e448c9---40911567261.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/retixeraxefulururobodir.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c32d8f52---popopiz.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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 17584 bytes
SHA-256: 22e3340c650584c4f7eb5eb2481f2657201162a5d72c4497a681f6655626b270
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10316 bytes
SHA-256: bdbed07ffebf8e1d19db7e7b545f7b95131a9b00df4180b8ed800aa5b37e6b79
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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