Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75e4431b117eb3…

MALICIOUS

PDF

95.7 KB Created: 2021-07-08 05:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5afa9fac72033a3652d67933864d5e6 SHA-1: d4c34ceb817697be7f50318edacf38b222b6cdd8 SHA-256: da75e4431b117eb34e5db644392e6a99ab1fa95ee0694302fd038be552d30da1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple links to external resources, some of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and instructions for a password-protected archive indicate an attempt to trick the user into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qi1sug83euqk6chvd7ogvdvet0/561474412.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/47145588854.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/59745479798.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d009bea5---zoropixizoravezipu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902c37d9488---rufililoxe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kovijosapum.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/eba0f9eab9b3192d8054073ecbdcfd90/28731386095.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099b35584b1c---23479405960.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/78077344635.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a5d018ee2d49628fecda62c1c849290d/87222088783.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd9f8ef148---77021071001.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/41163919c33baf85b371eb25836903e2/10207260591.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc188cebdf---48319837593.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/12b5dc97bfd87e8bf80beebb2a345b7a/zukenukijopukuf.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94fe8c1c1---zevabikulenivuxuzipuso.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/48557736110.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/jonovoworelukedazosutu.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/49166734538.pdfIn PDF document text
    • https://citytrafik.nu/images/file/33117826580.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/binerodezis.pdfIn PDF document text
    • http://amandamaitland.com/images/file/17858663050.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/31114567924.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fiekq4b83fap4nd074g3aemh6o/tibexinotoxu.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/susotugofoxuzuti.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cfa4e6d48ca47bdb7488a1f0ffeed15c/tenit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sexy+beach+3+free+downloadPDF 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_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10904 bytes
SHA-256: 2a5271fb8886711ecd88ec407c163cc59cfa719c5d886621701476a49640bf33
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 18376 bytes
SHA-256: e97edc13d702bf5e887450b00f14cb5872f89bc100b19e8fdcff9d846a38b37f
font_02_sfnt_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB6 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf

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