Malicious PDF — malware analysis report

Static analysis result for SHA-256 efedbb9fa8c71303…

MALICIOUS

PDF

111.0 KB Created: 2021-08-26 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d310350f55ba60f36772cf41d969eebc SHA-1: f1aa3a0c8254ecb1a27dcd8852859acc28266037 SHA-256: efedbb9fa8c71303249598267fe014a778737f485bf193845329a450de23b0eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://flardochform.se/userfiles/file/monigogujalumula.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d41d3dcdc0e8b8f77f59f9679d2da771/lifedolupetasiwuxiri.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/zosuzagimidosaparopewuz.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrkpqpejrin5rbmq1j5ti3ke45/zorepedafi.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8591fdeb1f---23759316258.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d74926d9a---kaxusama.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/xasanulirig.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9e59530bb43406ee30c1fed276e059d8/21442950152.pdfIn PDF document text
    • https://peterdegendt.be/file/punidobuzojadel.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/pokuzoxaguvesawovuso.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/73916671133.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fda3bc1076---80984921417.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead671a04b---48214814679.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2919478b5d---xuxomukugevofiregugejabuw.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/40220835747.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/23ab54b9ad83a0985cc82ce61b91cc56/63406422671.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4532fb7fa2041d7b2be90fe5e422fb8e/45699416099.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rejewasuzarabop.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pibumubivatikaxule.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/namivitidenogamorabaro.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32382624603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=existence+space+and+architecture+norberg+schulz+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001505e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505E 17844 bytes
SHA-256: 290506a82667566771b1df321685c42c1c8118a7f98c7850a3fb2cc5b997847b
font_02_sfnt_off00017e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E33 11284 bytes
SHA-256: d56dc445fccb56ca6cebd947c1002c68dc7c9642b131112764f0bec0798f6663
font_03_sfnt_off0001983a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983A 16060 bytes
SHA-256: 7e09a3551a5f95464d485b0302bb2ea5a0fc1ccd586ad0b46555f182e6907fed

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