Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d36b1902758931d…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 16:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 661ec33fd325072e7db83a54fb1c7fa5 SHA-1: d677dcd91d21705eedf1f3430035906e63775fcf SHA-256: 3d36b1902758931d7338f34195da97aa7f331ca56da85856838ed186bd44d7bb
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and disposable domains. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=combinational+and+sequential+logic+circuits PDF link annotation
    • https://cornerstonelaw.eu/userfiles//file/67116460816.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4ed0194d2405ca3b08dc8368cccb20f0/vafixoji.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b5b48537f4cb903468071994b542e64a/10522039333.pdfIn PDF document text
    • https://adikkedua.com/contents//files/jakenuripurupijumiwaril.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47eeccfc6a18a1a013fc4b93a8ccde02/jokelojexomipofodeve.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/funokunodajosexiwo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dec727d64c10a6ce7c6f89dcab30412d/87977124710.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095726227893---pisaxuvixase.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075dff157ade---8452957959.pdfPDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b45ce434---30362034041.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/xalaxata.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/26u51l0fu10anoq2dgj5ojrimp/tenixitunefamisojofadom.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/3672286825.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/767227ce5a9eb3199112991a302c12ac/guwajetudisesit.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090707b5afe2---91277700180.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/bf07skpkkf98u8fdh0mdt4vg8q/10489086849.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sfgi2vkosncfgnoe3sgmn27sog/lejitelotuzapexiwogep.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a772aa2aa13---senux.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/rkcjcrfse5tncasain5evitg68/35192256170.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af40d5ae690---56790489366.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609beaf8c6ec6---kawobepavovipu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94736caf9---54551404651.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3e83ca8de27d07fdba34e92e1c103571/83757146251.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_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 17204 bytes
SHA-256: d74d578cd77ed86f167cb48e4efc6af8aae28ce4ebbe9bcaae5c1e07ed06d8d2
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 11128 bytes
SHA-256: e71d0ff95028355838863a3572d93b58f9cea07e54c7f50e14696e374ae76ea5
font_02_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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