Malicious PDF — malware analysis report

Static analysis result for SHA-256 87849988f03ec60f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 06:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34b868c6f380d4a9863ed4546d5aa591 SHA-1: 0e0c3f294ccea230fcde972a7ff662a9738eca1a SHA-256: 87849988f03ec60faf30131f96c508cb90a3479cdd1cdaf3f2d74abfd7d54c96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087067858635---jumeg.pdf In PDF document text
    • https://rsebolivia.org/userfiles/file/54541352841.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/surenamebukaj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c43669e98b605e1335ac613b6483181c/46090359053.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e83c84fbb3fa051b331952ac0a7b4952/xolebujuvisanopofela.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/miwuvovodinula.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/60a6499ea741897de496ab12d6998228/90091754669.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210827005536.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/98902538046.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b6b13ce0---tipowiwubu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/11524176640.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/vudalatofugisofotamikedu.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/tarumo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/28361472538.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210624130126.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6cc2i7sjh35os5bn2umqt7mrg5/xabevudonanoja.pdfIn PDF document text
    • https://eniedu.com/data/file/20210905041308.pdfIn PDF document text
    • https://signika.pl/Upload/file/vedowajexerurajimemaze.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/2288716136.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5f8c819321d486a8aa200a7af98b7ebf/tikisujepene.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e47d0137---81053059211.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/24b3425487532279a442a41dfea65062/kesapivijela.pdfIn PDF document text
    • http://dentherapia.hu/files/file/berizide.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/mufodomozabi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f83cb6b4b---56399801047.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/90096484047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crown+5200+series+manualPDF link annotation
    • 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 17072 bytes
SHA-256: c59a450cdbd31ce7de76927e8b1e6cc14f547b81a9632e7b0dd89ca3f6e31f44
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10764 bytes
SHA-256: ab2eeb7244fbc47adbf891f92eaa226d2b2d8edb75aa8e54945836ff632c8320

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