Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d23e2abb01288b…

MALICIOUS

PDF

81.2 KB Created: 2021-07-30 02:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3d931d6312b3a8db30088125f4debb5 SHA-1: 754fbd66d36c7a19583d676938aad45750fc50fc SHA-256: c8d23e2abb01288bc2a54f48ffe95ecb850ba6506c7d8a2a1f727659756b8a78
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://sumosushingrill.com/uploads/files/pegebi.pdf In PDF document text
    • http://pnmanagementsolutions.in/uploads/mowafarilipibadisa.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bisitit.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607153127ed67---73134285740.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058c909ae1---ganagoxiregexu.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/222687622.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/842f8e5b4f04145fed6828e2d6468e75/mujababewidadujonalunav.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/58681034493.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215fa9cbbf---robelusevapiwor.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/jadamofiboremazoxagozupo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5ec4467f---xivuvuwimemowevid.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/074fdf2c34fa7d415fcdf39ddc6bc44a/85201205748.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607754897c418---wenuzalegetuwedexenetu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/92036851961.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2be37341---74314200763.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/72886927766.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/5761619644.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc60e4c55ef---74171958072.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b097f253c6c---wewawenuxare.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/lk8o3m66kgknnn69cvo8f8rreq/85210691890.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/18409875889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=math+expressions+grade+3+student+activity+book+pdf+answer+keyPDF 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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 11716 bytes
SHA-256: a57d5ef6f32ef4a9f272448e5ae6204fcabc9f3dfdfd9436118d354d9282d3e0
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 17760 bytes
SHA-256: 15c46977313104cfec6a6a946292e945fab826cc46a62d27f240f94dcf18764c

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