Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f17bc77ec779bf…

MALICIOUS

PDF

98.2 KB Created: 2021-07-24 15:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 85eb78a0ebf4db0de4db5fb2f98b0a3d SHA-1: 0ca5eae5c652160bdcbc1738e0094d6851a7b872 SHA-256: 05f17bc77ec779bf79a8991466d8f3d65acbbcbcea7f5fd28ab66b5f6e2ca23c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://cihangirhotel.com/upload/ckfinder/files/bepevusa.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d90295e723e5ca77e86c5046e189d158/23885746965.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/rewuduruzofepobup.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/65953671148.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/majiz.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/ratezeri.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u0h8fofjhi2bqtmf53hh2mpv92/fotutemavegukapab.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a921accad---76714601637.pdfIn PDF document text
    • https://computerzone.pk/file/63386358165.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c13c0fdc022921cdf3ca7d5d8abddbf/7611237475.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/81978695678.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48dd70b3f---neriba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9d45be2e---8904161754.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb598d81f3---mebilewemobizagafaraxoz.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608caab6737c9---78506077821.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e38f2a45907---46115907881.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/11119527723.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4bf093d---48787946516.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/80186700287.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/bedejimazudukaj.pdfIn PDF document text
    • https://biocoils.com/img/file/maraguve.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/4131730706.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e74baa32c---85906425598.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b627ed97651---sojoteti.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/99879455822.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d7c3ed65a39e8ebd2db349074d8e57c4/6033021208.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3713af9b9---37732177648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jurassic+tribes+best+chief+eventPDF 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_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 17740 bytes
SHA-256: b7eb442016bac19d2998a1d8d42e329b33332b0710d3150187916f8d455115de
font_02_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 10564 bytes
SHA-256: ec23dc66e9b223949e8c3253359216e6bb1e3f253428181b6c81d1790b4f3f77
font_03_sfnt_off00016039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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