Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c670f51092c0c…

MALICIOUS

PDF

92.2 KB Created: 2021-08-13 14:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: fe68a6e8ad0b1d2c8db12da0bde3fe9c SHA-1: 446990fcdef4d6ae9012f583b2e81c25313c81b8 SHA-256: c17c670f51092c0c3d2fbbcf44469377a76746d8b9281920c3a147141b4e6802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa85b2f83---12181312142.pdf In PDF document text
    • http://www.bandungmesin.com/file/kagomuzupidelavuzasofu.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/tudezatatelode.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/7164814543.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/73542679014.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gebavadebubato.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f10f311b864---bipuboxijovep.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zumorafimajevuperoler.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59136628725.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/pulobotalopanukab.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vm1a3l1rj0e65ev9pmjqovqa05/dagefi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0fee9a3e7c4104ea8850f5c3abc0179/peposananeziposagavujuve.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/98885693184.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611ff97d7c---79769063320.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/mosugilizokexumawolaf.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/tuwinezajupop.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/240300657.pdfIn PDF document text
    • http://premiumtrade.ro/ckfinder/userfiles/files/46146334610.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xokoxude.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bivuzul.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sidezomutixesokeguxurun.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/97844365073.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/77918838915.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ae21d395d26185ee5fe80502b3b8f28/bimazuliminupofog.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa16cede0---55358089689.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0b115d3e969a5473028eadd452bb4556/93406110415.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/90353607858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=d%C3%A9marrage+direct+d%27un+moteur+asynchrone+triphas%C3%A9+a+cage+d%27ecureuil+pdfPDF 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_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 11468 bytes
SHA-256: 4ec3be1e60a89f52a6b901bd6d25fc8e58e3c1b1d8bb0bc195bf83f625b2067b
font_02_sfnt_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 19132 bytes
SHA-256: da08b4fe89a1a349063818c6467bae938338c976cb6e55e2010ec65791349078

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