Malicious PDF — malware analysis report

Static analysis result for SHA-256 60573d28bab47e4e…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 19:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 829bec6e68401b1a0064954885b098a5 SHA-1: fab3693d568e2a70161efc099bad2c2e0d0823c7 SHA-256: 60573d28bab47e4e7a365f97ee82d17cb89938d74673b364157010d27bbd947a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://asbufestival.com/uploads/FCK_files/file/77772861350.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/qcsnck2qfrqepq0iijs99i0piv/xibetosidu.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/xufilu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cihiqpf3q6so6v94slecj866s6/pitepudanere.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xuzoxivafuragoxufuvexu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b038417c49a5ae6221a8e0371579f3ca/rinimitibedoxited.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099032052f11---75021479191.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/voviradopunukuvinabuwo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd72e0925---zomimajafegekor.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g21emg2n849ldq7stluiv8ek66/lariwepegafomira.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5f34e077---lozosafafi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45d4506a806a6d3c44ee5f5e2d43e66a/zorijijomezagi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a98eaf78---rojivezupaxewir.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/gulez.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/80b39b809b611b91588c8a53c198a7f2/13178179884.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab928a6e76---37693254174.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77908508a2---1745456786.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zimatoxekalakakakakezugi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rurosijolexo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11593372776.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bejigizamowelini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=insect+walk+cyclePDF 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_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 10152 bytes
SHA-256: 99411d1c6eb043cc4e511d4fc49a9f689f893b5c3b0946fc13f6df1735aaad57
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 19200 bytes
SHA-256: 8c7fea17c25655e868f9b0faa5062beddad964cb80e8999b8f22e575cf329383
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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