Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0b0420592662c9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c07b9def2644a19809674281574aedb SHA-1: 6f3d25a832736e73ba7b1704d33b89cc87c8f725 SHA-256: fe0b0420592662c9329f8712886b7e04c5f85276433aa5cd841405aefb77a020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://szjglaw.com/uploadfile/file/2021091207413073499.pdf In PDF document text
    • http://www.gonouvellezelande.com/files/82924035459.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zuzonimi.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tawixuxiru.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/zuxamux.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/bigeludewupibatorewiwip.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/dasofig.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/48045473710.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/24218633572.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/afed3395f2bc937e421d190014d11403/58463570267.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/ninasuvetenunedafivoz.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/wabirixipipa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed53dd7707---nevuj.pdfIn PDF document text
    • http://drironcat.com/images/file/25836046894.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/47190955914.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/zafawu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/gaxivewederadaramugor.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/17768202209.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/wabimewobofo.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/febaxexovetejujuvubufukiw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8388d981---30778816399.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/80432321110.pdfIn PDF document text
    • http://futboltotal.net/images/files/doxojifopobujupexegudid.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/rozobemikowuxuzirakolito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=contact+sync+app+for+androidPDF 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_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 18056 bytes
SHA-256: f31a1ddc1511469991ac9dea02ff7cf68e0773c3f135aaf52d21d1665485838c
font_01_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 10580 bytes
SHA-256: fa311797cc5363fb12e6e50e263defe29eba152daad3e33bf991b780333c3718
font_02_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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