Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6846f38e1f50bc…

MALICIOUS

PDF

94.5 KB Created: 2021-08-04 01:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d25c49e396e9b1f15a2c9f3e310e66a SHA-1: 4a93ed095dce00814a792fcec21d7b744a2af144 SHA-256: 9c6846f38e1f50bca1eb4a44fb20dec0c4471d4e3755db432c9202b6db9ac2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=december+weekly+current+affairs+pdf+affairs+cloud PDF link annotation
    • http://vencedor.coop/images/admin/file/81863797224.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/12887334700.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa63f7e107---20035436264.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061916534873499.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/71860215450.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/08a9068f4432f37a4f478841be96f0c0/potunetosopegibod.pdfIn PDF document text
    • https://energooptima.hu/upload/File/77009257081.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hsh8t2t8hrl4s0f70r1f8vrf7f/tejuz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bd2a02e3---62706956030.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb043bc241---juxobovurifukenag.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/35182074733.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/33406332614.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386127d3be---bosugegejekaxaxen.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/pibabenatome.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/dk1uu1q7alk73e5eb2ij430i8g/dubusefu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373978d1ae---badilugozagasewepa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f321b7714b74cceb7b31ae87bebc1490/talepedonebividufuro.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j67b7666bucufk4uvg3d47fh7/dozilakoziwixomarin.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0fbe8bd6bf2fc4d305c66aaef24d984a/kinojadekepivemi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607429962543b---96735306673.pdfIn PDF document text
    • http://checopharma.com/upload/files/16309791721.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/17624963475.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/72686491129.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_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 17536 bytes
SHA-256: 2721c0cc46177d99409d5fb84b5a439d6f7fb9a7a7f02eea96ed034d2dfdfc0a
font_01_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 11316 bytes
SHA-256: 01c38c3cdfe0a620ccc01b5878a48cc20c30737f6f5252eb8ccd1f602267de88
font_02_sfnt_off00015140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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