Malicious PDF — malware analysis report

Static analysis result for SHA-256 f560d4a971e7813e…

MALICIOUS

PDF

67.5 KB Created: 2021-09-25 08:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89e40bdf3af44140b512fa42aa9a46d5 SHA-1: 6dc7bdb9baa22db50475d091d661b5c763ef12c1 SHA-256: f560d4a971e7813e546e2896bcd7a9e3bc2e6875c57694d3717e2c66887a745d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous links and the overall structure point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5450

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://thuanxuongmonmb.com/admin/webroot/upload/image/files/xalomuxuvibuze.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca6578911---71481452262.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/29749494148.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/dusejopuzarulamuludub.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/tejebilitabajikubi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dolumaxugomowefedizuzez.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/90b74b08a7dd7f1e535dfe1787eed12d/tufosuroxidesude.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/65877083387.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/tuginurudimuwudi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/88584348018.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/tunorefusotojajaxudo.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/xowemaxigibitofufufur.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/zazubazoduxasaxexiwur.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/69555912060.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/39336702991.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kewufiwiwinowaroxonazi.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/davasofemujeripetun.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/sulibexekopumokalida.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e63dfc65f2---38016368454.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/jarejuxatad.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/74764242937.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/13089469556.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/dojatazerinudanavixoboxa.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/xetupobunolilofivim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f295c0b8ac---tamije.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/39564651151.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jodupuxinonomovoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lady+bloodfight+123moviesPDF link annotation
    • 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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 11216 bytes
SHA-256: e58b843b425e305612938f67207968009bf85e81a43e12a709812dfcfb36091b
font_01_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 14928 bytes
SHA-256: 1eb47d0bd1476f349b6d7611af9fa2c0fe224ef5cc6d8688977262689c1593d0
font_02_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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