Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefe6382f5a213ff…

MALICIOUS

PDF

111.0 KB Created: 2021-05-10 04:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ce4a789de25f2884e9294171183f4156 SHA-1: d135aeaf323ab6ae48b02ba23163aee057bb1f06 SHA-256: aefe6382f5a213ff4f08b002ba6457e620ecd72caadb81f6f73fd4f96c8c30df
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, which host other PDF files. These linked PDFs are likely intended to deliver further malicious content or phishing pages to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9531

Heuristics 5

  • 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
  • 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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0274cb0c3692c367e810ccb1ff389c23/bigegotexawod.pdf In PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/28b75f8db1b935a2561fa86d6aabeffb/75336451004.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e8ce77b5---66630754338.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963fb904449---28471984856.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077909fbad71---76213354995.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091940672f8e---42916820613.pdfIn PDF document text
    • https://andrejc.si/files/file/kelezewedifasigamuk.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/68853649110.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160960adc1dde0---xetivitunipoxajedevig.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160874d75a7408---sasunipujuxaz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349fb690d1---dubad.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160728a8db3af9---87877734798.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d77f8f12d292d696eae62989223e0cf7/21614484563.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc9be2c10---30362138595.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/16614409951.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160980c902f1e1---17435363588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chola+dynasty+information+in+englishPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000193da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DA 5328 bytes
SHA-256: d63b971a24ad65806eb176c7e5c7d4f2caee561d6ebff6ec6b654f7094aaac01

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