Malicious PDF — malware analysis report

Static analysis result for SHA-256 57941015b8753b0b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 13:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cd98a030f45fd609132640a967b867be SHA-1: ebf551a5b0ef23329c5796556afc5691a17559cf SHA-256: 57941015b8753b0b062bf0b7adb6fed684fad952e4ed305e944d9a82b12a4bc5
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6941

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fanaf.org/article_ressources/file/latiraluguzorawazej.pdf In PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/85804482633.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131511ce2329---mubosixanusibeliwujiwane.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/ketoriwogakuzeperatug.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fcb1115368a083ae262a64390c5f1c36/70465373934.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c630b3bc5f7e591e55da56b6cabfc434/kijosilulaxirozab.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/aebe90fbef1b5f62151c8c03ff3eea67/zeloderabalelomobupakowiw.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/16819939531.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/jejuralovokup.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/57359991212.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0e048932a---39895104276.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/mejofajaxu.pdfIn PDF document text
    • http://land89.com/ckupload/files/bitejurabulameripodadoza.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2bb7126f3---misigufirapavozalado.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/16620800971.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/23690166157.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791aa63e91e---65311084545.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/332d7fc9a0b4c36e1568e3df942e49d6/76928446801.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/1330719831.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/44710826291.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e52f353ca---wavimibotos.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fb66974c9---23693161507.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tjj7t2ttocsndt0lnfi8vcsoa/risalasevu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/zaxap.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db12d62253---pafowekokibujodovozeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=epson+lq+310+manualPDF 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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 21724 bytes
SHA-256: 27659a71ed30cfb215d608ed15dba957152daef518b850c2a2a979e07d58b033
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 10564 bytes
SHA-256: b15fab6aa4f7e93b50f4292a5724d3c3ccbe7ba92d53953b0a1e7edbef993434