Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b883c7ffadf7d8…

MALICIOUS

PDF

93.4 KB Created: 2021-08-19 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 91d485182e0e675dde23d820bb95d680 SHA-1: 14eb700d2c877dff41460094c8f0664110ab64c2 SHA-256: 74b883c7ffadf7d8c668e5695bdb0d083c897fcf595f33286c0a2b3ff0bca609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The file's structure and embedded URLs indicate it is likely part of a phishing campaign or a distribution point for further malware. No scripts were extracted, but the PDF's nature strongly implies it's intended to exploit user interaction via malicious links.

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://crysiq.ru/uplcv?utm_term=aprender+a+dibujar+manga+desde+cero+pdf PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t612peb8oqsjp1jsn3ufdafl5c/maxefeselokune.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8e800ff6a9390e85d7c2863c0ca910b7/34699649864.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e216ce5a6---42257391497.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56efd9e56c---59350295472.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cbc06dea8---36205324557.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/46704593651.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24094003839.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/kasekobemalitaboza.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/86487805825.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-23/20210723172527441320.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8ecf161f5---32863607987.pdfIn PDF document text
    • http://aurora-c.jp/files/files/66324886774.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872f39a7fd7---bafugewixolorakewewefug.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/85238858850.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/bbd359cbb4ae1040e45137230b410cae/kegabumudofe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28aac8fd6f---fijenupoti.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kih2irosj8nufj6il6obn861t3/sikodosifunivabudaraf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b602da310bc---guxapusizesuwobifijerego.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b9cc2039a78eaf786a153200ffcd4615/pikul.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b97e3cfd81e445abcd8c59f7fa3a0abd/xisupakabusosufiromi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/85678294268.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o9api6k77qvh355mcgbv8vps7s/nunami.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88ef5ba29---86482669230.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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 11168 bytes
SHA-256: a4f4adb169445a9ba2f8f3fae44d088bcbea145bacea3176339c01ce76b8690b
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 18104 bytes
SHA-256: 1b369f38774ea2dcdd9cf94e465f9fe1f9e72df08cb9a489d32048ee1877bc79

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