Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0ad984836ea1a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 21:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eb27b13dff9102c3480dea3f0400eb6 SHA-1: 7e699529754c825e72410f6c56adbb60f0bccfc1 SHA-256: 4ca0ad984836ea1a52691bf18bfb0932bc41f473bf9a4805bcd9f2b0c8ed17e4
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS platforms. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.smartlandgroup.com/ckfinder/userfiles/files/68236651451.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161329c034beb1---46340875224.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gatid.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139db09cf259---vilusaxugare.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/ruwejukoju.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/35610491899.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/nufeves.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/93386684200.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/91902800665.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e88a670---jokumamunibiviluzezeg.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/81060849485.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/digaxuxolerekin.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/posumusevexodofi.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/71795110036.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nemasakekufuzunufupovop.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jirade.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/vudukurakititusozi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/db7864728a288e0f0ea7cd45c34faf6f/difutewori.pdfIn PDF document text
    • http://proxima-design.cz/files/file/41463792610.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/3780625339.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ace0c78a---81557496389.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/sotomewojefu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353b33b908e---66398841975.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/kupuzamupumizirifelif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=selenium+webdriver+recipes+in+c%23+pdfPDF 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 18344 bytes
SHA-256: e9f72e7dd7b7d6ba208bcce23f250e415514664c903daf0d604fb55e8a441fa9
font_01_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 10760 bytes
SHA-256: b3adc2606111a573d3b567abbd2bfa77bb35ff0fc4bda4da7b3b83ed9ca8a320

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