Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daff177368f3092…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 05:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 543f6dee49e0de995009303b152d3125 SHA-1: 891b355744ecf9fe733ba03a8b153dacb522f34f SHA-256: 8daff177368f309282af73aa2ff96c6862adea2e610961d02321d026580bcb2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it is used as a link farm to redirect users to malicious content. The primary purpose appears to be directing users to potentially compromised or malicious URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cbcom.eu/ressource/site-image/files/delubu.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8209a567f---vijebubuvovo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/12620100802.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609760f2e3594---22921837942.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18738047876098d88a0fceb.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94838174327.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/bupajabufobemuxigifazami.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf57946560---77556960066.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/sovokomitolupogu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/eb975dd77254b4319a17aae5792e643d/62994361031.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9em3ve78krija6kkfh1maj8466/junagidibumobusebejefapoz.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wevomerezezenop.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qrf57b3vvaq7t2bs9kqdv7bgv7/zolurogevu.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/zomipakubozaxolanewutogu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/08a8f719a25a7bbe6a499386f10e73ad/43271149919.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/69321082557.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82105061921.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30767e2cd---gufafirirudotomaz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b245bb1e543---lesosalelus.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5da40ef91---69616122839.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/41026401832.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/9831861532.pdfIn PDF document text
    • http://skupka23.ru/upload/m/2256193200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=california+residential+lease+extension+agreement+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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 16996 bytes
SHA-256: edb11348c7781e9c9f1943a8c4a68a496fe18085570df9ee4f6e22ae006db328
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 10976 bytes
SHA-256: e47987b20e6c2f0e34e2ef569d3fb0f91d8c904126f5e48068c7071ac029a17b

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