Malicious PDF — malware analysis report

Static analysis result for SHA-256 62351530dcc69321…

MALICIOUS

PDF

76.2 KB Created: 2021-07-01 18:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8362ab153e9b1b50b0d1621baf6c9c1f SHA-1: 9b814452fbc3ec201aecc1e2e13ee2406e27ff8d SHA-256: 62351530dcc69321480e2b2217a3b779c7a6b91960ca9cb523cfd92f2b0d67ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to external sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6513

Heuristics 5

  • 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
  • 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://munord.com/wp-content/plugins/super-forms/uploads/php/files/fdb2973fda75aa6ed428653f092af58d/vokaxuribemule.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/71271b6f6d6926a8198ffa18415f2c0c/sirirexovikifaketojos.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fc2e808fa87cfd76481e79bf71e32be4/walokusogepimu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066e9a83b---dalatodepozurogidasisam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b30003b3d532c4b5903a0dcb94d66a91/27194083047.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/032050128519.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/kifegipevanuvixijejuku.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/df7ce1e1a74f426e8bb628cddef12385/53725082042.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57a9fc9328---41069937792.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/nh5gh2k4jl2bgd1vdd9hh2s8o8/rezavutaxaboziponunidepox.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j7dbko91iv0a09s9uumuuo6t37/kufowuverepuruzugaxovi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tmmmi48csouku1irr1hu48i757/lanigutab.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cbd9006abc8a32473c93960578dcda1a/63915462297.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86a2e4017---nibidopazopofosuwibokax.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/37667478018.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/lusetu.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d43363c7f7cac3c4a309244e44949dcc/99464948896.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/lovapufebemu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ruzavomij.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/minugemerixotimusi.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/noxujosupifaza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bb3f54e7829c7f761124fe9d0bd346f6/zogevupupametanivon.pdfIn PDF document text
    • http://dgjst.com/upfile/file/46733428430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=academic+and+professional+writing+pdfPDF link annotation
    • 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 17708 bytes
SHA-256: 919fc18978bfca61fe63bc0409462ce31b98828501ef5f7ff633ba389f1e2f5c
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1