Malicious PDF — malware analysis report

Static analysis result for SHA-256 b351bb983e67f67c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 21:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 476a99a33e9511fd46d7cf154b24e369 SHA-1: 234fe03f8431aa6d1fb2901c72f9beba9b3f1e8d SHA-256: b351bb983e67f67c18af01d702d8b0b3952ecf65f1ba5ca647355e9c68b49e9e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3637

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://cructi.ru/uplcv?utm_term=have+has+had+usage+pdf PDF link annotation
    • http://chiangmai-clean.com/user_img/files/79496933963.pdfIn PDF document text
    • http://wwstationery.com/files/file/88556594650.pdfIn PDF document text
    • https://cakkue.com/contents//files/voginujejitu.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/11615504055.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c6b60a30e6f19a3eee475d0a52afa8f4/marefomasaropewivam.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff735ddb19---valebewewumo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d65e7439---vapesovatoruzufonetezusas.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/83147262176.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/water.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/03t0enleeq1lv53d0mhnfa4lc7/63816249553.pdfIn PDF document text
    • http://unsersohn.ch/images/file/fejox.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/f6d8e885302ba763749b46fe48f6d6b5/76171062540.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd2b183eb---50302979297.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7e6a1c53d27d9a50005f8b78590dfa02/76519417369.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/linufugowetatod.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a47b7o41nch0k4s6p0hj3i9es2/betorotukelimomax.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/44184832497.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/82017081872.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/70750795328.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b0ab451ea03a3f3aa01c546af6f52ec1/70522317916.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107090758525526.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9544e2ee---39883359800.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c59fc76bd7df48163c29207bb23af68/92080883510.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/34765799004.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/bajilovetudekus.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/xeneporediga.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 18040 bytes
SHA-256: 146109ca6f909aa3690286c6a140bfe12fc55b55439c5f20a13c7b10526906ad