Malicious PDF — malware analysis report

Static analysis result for SHA-256 976be6955d4f506e…

MALICIOUS

PDF

98.1 KB Created: 2021-06-17 13:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8bdc5cac018c4ab41b8f488bdb4c0d75 SHA-1: ba0049c3d9e73216f9170add2b62df0b43279a0d SHA-256: 976be6955d4f506e99e71100998d2f501aedfb6efe8464ad328638019a690ef4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations hosting PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm on disposable hosting and compromised CMS upload locations suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df59cee23---timadumosolasivukijegabu.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811e5b138b8---8460625964.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/49735156346.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xexofiserivir.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1d6795bdb871ee97b04b567baee34ea8/rifudab.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c84d46c30---sisosokajozusipab.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ed22a025---wokax.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4iam00lb4p85lc9ghuhatqpi05/77788534100.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/8044473852.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da821d4e7f---86442553821.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/28439289627.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9e1de4dd---ribuvuvamib.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/634447a20f78cd78a933fcc7c0cb1e6d/fimitabusuweb.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6f8a7528---kidalexozenumemov.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4c9405fa0848b39d14952dcd0743caf/ruvolijimepurigesasapawe.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a6cd70e48---76984405557.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/217d48161edaa8df913eba454e1a53d4/lalogubowizixo.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/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=us+dress+size+to+indian+sizePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E0 4828 bytes
SHA-256: 6958e92e4e20e456e5551faf438a740560c4b83f7b2866c729aee42ead2dbb42
font_01_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 11840 bytes
SHA-256: e21d589970dafd9406b830735868303a57c8787d9c14d692e8b6e8eb1a58a8e2