Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f755a0c08d704d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 10:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf74202908fa2a444e0758ac3abd4864 SHA-1: 8d0d34c4bfd2a8e3b1a4311555dcf4d5503a5e7a SHA-256: d6f755a0c08d704de1c8204d601b8beeaa9d1bc0982abd1cf3d93c770eae8f9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://inwebjor.ru/uplcv?utm_term=android+developer+resume+5+years+experience PDF link annotation
    • https://somogyplusz.hu/files/nekilejug.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wunutufunitajuxavomaxi.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/62554522559.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bevatuwevupalubapetonejuv.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bujemerogezumeseli.pdfIn PDF document text
    • https://agros.net/uploads/file/wejudupunogatozexex.pdfIn PDF document text
    • https://gilbertems.com/videos/file/buwewulo.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kiwenewugugegijisumaru.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56585252917.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/2633950951.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/3875710889.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/45762962459.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/79562311412.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905150426_1091946887.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/febiranitodijajitenizoja.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7c6ea236c869bbf294539e270999cde8/lajajekolenawezufubakil.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/dasotevevavoz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/127f37f4a04c1b6eec8c528825c7ab4f/jukamite.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341edcb0eab---jewitusakununu.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/28143388763.pdfIn PDF document text
    • https://sharenkon.com/files/22742421511.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905052020380720.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394433d62a1---44556351176.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xulipadake.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sidadajozazutupewimumud.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/43105110556.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/82563037265.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 11076 bytes
SHA-256: f21ee6baf10c073dbb3f43a18c9a9b9e5c74adcc9e044fbc3abaf14bd1552662
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17884 bytes
SHA-256: 1761b1cb95db587bc51795835f1b57a797e8cf186ead42f78f63495da3eae9b5
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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