Malicious PDF — malware analysis report

Static analysis result for SHA-256 2729c85fe41666f5…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 04:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e9cdf7e9868de39c06445007eec40be SHA-1: 965ebfef93185e0ac6be66e802fa239464adb4d4 SHA-256: 2729c85fe41666f55c12445508d27c1db933fa4f4d0feeda502a58ac1d866a33
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms, designed to redirect users to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs indicate a link farm designed for SEO poisoning or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/25431abec076d0e9f81b0be322f2d34d/mokewotusesofiwaseto.pdf In PDF document text
    • https://sambelteri.com/contents//files/24342828931.pdfIn PDF document text
    • http://kmsenior.org/file/files/pegoxisalubadogu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/boxoxedela.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aaeda0a49---71798186100.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c207ec3ac---75629302089.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/69346848474.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac219fb4dfa---nonimudavepasetexin.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/71303068020.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/45054834145.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a09870d25---gupozetigoduzotojore.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lowumixizosumiwapimi.pdfIn PDF document text
    • http://nakatka.com/files/file/livilidupafafo.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/79151822014.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af825d014353ebfe24cae38cc646e089/jisufoxinujuzo.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/lujir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd97a999eb---33283094776.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/mozilusupeputenotumulezux.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fafajepobufofujazasotuma.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c98335a3---jitunoma.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fagakoliziwibozo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9284def0d---96711011086.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/42592382422.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/zanelobatakoviguno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=arthur+and+the+minimoys+2+full+movie+in+hindi+download+filmywapPDF 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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 11232 bytes
SHA-256: bf668481936465122f8cde53e47329dea246f3f1f42c2a18535afc5effef3394
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16884 bytes
SHA-256: b1488315ef44e468d5786dba0f83704ba2252d2b829bdc0b5070ef46f16ae4d8