Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6fdedbf2b3f77…

MALICIOUS

PDF

90.9 KB Created: 2021-08-02 12:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8dd71636e40cd4530905514eed1f132 SHA-1: 8bcbb5ad1c5980ac7dc9b2a2d38e01840fbd831a SHA-256: 88b6fdedbf2b3f77106a64b067e0210fed4f0ab634b891f083f8579b2cc7c0cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to host or distribute further malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607238ba734b2---13452090712.pdf In PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210624_D2E2D61DBA8ED69C.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/fejuteluxuba.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291a052de2---zajorubegaxafa.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c336177f---fevekumixexulepik.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/bodumogaxanavajamigesuxum.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a107c8b9616---72427219434.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/78961933466.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/14823688630.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a2fa26217---32270694530.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/jevodidexerenina.pdfIn PDF document text
    • http://derma-dts.de/files/file/rakulepud.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/41795190554.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082767ca424a---27364342327.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/wezida.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zebakozebi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nd145b00in10t9upk1d14spnuf/79104080881.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d647d36d74c---samub.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/926f7b06b2b93be9e5e5301d770ebf14/popopakepobavuv.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/salujafapixezuxijimulivon.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/10634255913.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879b20c4f08---tajomi.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/65604904625.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9912adc9---63080392983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dfx+audio+enhancer+pro+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 2892 bytes
SHA-256: 1168c7a6318461eb3d02118b8b435d4f050ef1b2fcd5881a2b0b2d72e0e8d3b7
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 17972 bytes
SHA-256: 6866e133a162aaf60bff81f629640932d04d70acb7ad312d8a972d43f34b2d9f
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B2 10868 bytes
SHA-256: e7d27149f33ec66276b8beaa775f0047d934fe43d073d13bda7e4acedc1755bb

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