Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fdc09b5efb6635…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 03:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3daf9d892806d17e0f653515fc105db SHA-1: 031faea2243bec340d46b9421de5da9abb2753a8 SHA-256: 49fdc09b5efb66354cc4426dd3a3001936790d5c0fca59351f3f0e9173183abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://laborke.ru/uplcv?utm_term=app+not+found+in+play+store PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f5dada7dc3d81a01da7bb616cbac0829/39889011465.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/44417643181.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fozuxukamiruvajesu.pdfIn PDF document text
    • http://rrarental.org/upload/file/purowodadu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/12671873401.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/91299760811.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fuvumekekekevu.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/89586961848.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/rizidapepu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3642bf1dc---17306036241.pdfIn PDF document text
    • https://megashina24.ru/files/files/lejuwugosafotetu.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33415667902.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/20773672401.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/21468705222.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161455c6dc2c34---bosorotuzisavorilusa.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lavawuxisuto.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nelikezamewufuxe.pdfIn PDF document text
    • http://air-ned.com/uploads/files/temubigur.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/79029134922.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/99722851680.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab6f115fe---87072251539.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/62150837023.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/jirupidosi.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/22086474771.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/14556820527.pdfIn PDF document text
    • 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_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10684 bytes
SHA-256: 75c1e0d496e8625451fa28c6d682363cc1ba7acebaffefc8d11303ee3f450fb9
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 17724 bytes
SHA-256: 46f8a4c531f9645159a524e8a883bb9bdcc64bfcb354511d72fd624dff388d51
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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