Malicious PDF — malware analysis report

Static analysis result for SHA-256 5997e1a85f7739d6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 15:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e062b0f5e3d366f93024d4ef6dd5a07 SHA-1: d499ef3744e00d7d869c48b221d14bc955f29da3 SHA-256: 5997e1a85f7739d6837f479c7ebef451168f6ccb934fcdaf04f53f1aa75df6c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to content hosted on compromised Content Management System (CMS) upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=how+long+is+chicken+good+for+after+you+cook+it PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qj7svf63kvi634c0e9jfo0n6m7/dixupasudanejonadoxatavu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/39954229423.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/rolazomefizakajov.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b13d6f6b4---seveninuv.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sewakal.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/fimigawisopiramir.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xozaxewuw.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/86755362583.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/xisojifuni.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/25386589943.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/45835388042.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/zeweloxesofotun.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/19283181516.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7af4be97---69565377910.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/98006955475.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/totubebenijemelep.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/90155524662.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pimatiju.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fukazubiruxaxogem.pdfIn PDF document text
    • https://castel.ro/userfiles/file/lefedetoraxogogokewumive.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/sijuxuzuz.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/vorokurupowovuruziwope.pdfIn PDF document text
    • https://alpinashop.bg/files/bigiwazuwidedojoluzesat.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/89342522205.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/38b5ffb975410b33454e3029731c1eec/9282623416.pdfIn PDF document text
    • 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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 11136 bytes
SHA-256: 3fbb93b285cd5dc22a7c86185b6469f3bf3e067136c4993b5b1e3dc1bf4ab309
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 17264 bytes
SHA-256: 1a0a1935d67f9d267d5a559aaa58e2c49f83c7ab121126f351df53532262909d

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