Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc0824cbef0e1a1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 13:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 548e5e87a3ca59f5daf5992d8d1927e3 SHA-1: 448dc9030d4df737ec25d2f264d292430dc0ff3a SHA-256: 9dc0824cbef0e1a1787ed7edb8f202ab3b7c196cfc264358328df315600e4a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of these links indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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
  • 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://oniceh.ru/uplcv?utm_term=rom+box+android PDF link annotation
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/29508778867.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614283cab7289---37067338588.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/nitafubafenav.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/fexopujunu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4ed8c6929431aa39ec4aac199d83544b/rerunatukukila.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/72841844051.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/binubazojexugavuvitirali.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/93817352011.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/10512126748.pdfIn PDF document text
    • http://pb-book.com/user_file/file/kixunija.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gomikofalafibak.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/43225470610.pdfIn PDF document text
    • http://le383.com/uploads/files/vigagegaxenemosesu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/ruxomopi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ba402b182464466a353a54c1f6cd8739/90666701738.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a207f4a470---4333711967.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/61427625249.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/winusalomosumap.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/38736599492.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/wufinenew.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202198124847781.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/topawibudup.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/336856650613b51ec3cdb8.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/texafufovinikaxinosafafi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/7452174363.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/23774272574.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC014 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 10252 bytes
SHA-256: 348b943fd2d7287cd548c21bb590725a033811621c08f1e944651c498d71e1f4
font_02_sfnt_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 20064 bytes
SHA-256: 44f652e9484b813555be0b40eb42292bd7e8c3841e78a5e494ceca963895376c
font_03_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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