Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef51450243df99a…

MALICIOUS

PDF

78.1 KB Created: 2021-10-05 01:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea4f1c49c37530214dc850e63a1ef937 SHA-1: 067caaad78a05c24fc033f3fa28feeca526db976 SHA-256: 3ef51450243df99a71726ff33e761f546c10fa47996c8734c4e7da126f7ed6e6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and link farm behavior suggest it's used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wsm.hk/images/uploadfiles/file/27584715054.pdf In PDF document text
    • https://fong-cai.com/upload/files/nenokawelewimexopujanuf.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/82284460593.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/woruxefasidalefurilik.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/53734632526.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/85762578751.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/93915916749.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161593e1219880---midudesixodojinibufuf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/simiwumevebipe.pdfIn PDF document text
    • https://pkbae.rs/files/91232872766.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/ralekitubodun.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bugupiwejamuwi.pdfIn PDF document text
    • http://ativn.com/upload/file/kuxefarulo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/vukowisefi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f21226e5a06833aee6628da8fb3b82a5/13842563616.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20211005_F887727D22DC538C.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/vigabejopad.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143605bc6bdf---wufotolow.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/9449496217.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109130407583863.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/levivapuserewoj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/65326357556.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/vozakobafemuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+manual+therapy+pptPDF 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_off0000c94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94B 18348 bytes
SHA-256: b43a8d58c4cb267668dd4deb6dfa555ace2a5580489a9da221e2cb17df9d4077
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10828 bytes
SHA-256: 43addbe7d4572b1db686c40074f2455b6f3a8996dfe34a97d7d2c32b4c7efa51
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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