Malicious PDF — malware analysis report

Static analysis result for SHA-256 87895a2997127d5f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a31ea09ba442bb82619c026a4977d54 SHA-1: 5c8da1c984dfbb969edd4c32bc74f73ac9efbcc4 SHA-256: 87895a2997127d5f925f381f105d0b3ca4ecafc38fe1bc90bd5616f2f3862b0b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bsa.by/ckfinder/userfiles/files/29784589525.pdf In PDF document text
    • http://stellamaris.cz/userfiles/kogede.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f2a5fff814f9466b5ab27dcb35501cc8/58777748025.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zosajelij.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/46024971979.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/99681495969.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1c853df5d33a8c69874949c07971bacf/79223201095.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/28555605288.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/98266940297.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/1430650881.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610482d5299da---jexalekosupagukuped.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xajulo.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/salenegigera.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/sevedinosivifetivixenofe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2cc75b4e---1930738501.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vobozepogenenolulofopuw.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/21235619729.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8fabcd70f---91297222074.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/sorub.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ce99549b---rajiwago.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/21108106912.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/42732747760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=glidescope+cobalt+avl+service+manualPDF 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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 18168 bytes
SHA-256: e6525f4d4a36adaaf21bd390c9222248c6fe0de7054afe9f9ece2be49340d7e0
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 11020 bytes
SHA-256: 7ae632c5b179123cf6a2c500eee6307acf7a6fd34987597cabf7c98712261dcb

Open this report in the interactive analyzer, or submit your own file for analysis.