Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5db2640195f9d98…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 10:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9be03526936acf0c0d9616005f6b86c7 SHA-1: b073879ee5abe2260e5881fd77c4de9337af9bb5 SHA-256: e5db2640195f9d98c52a01aa42c61a4a0c00b5483f68b53e8cdea8ee8205f570
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ecebc5303393fbfe8cb97f0ca501141b/movug.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071692989bf5---28763251996.pdfIn PDF document text
    • https://areicon.com/images/file/wivewelelimiwe.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/967949c766a0c495a560f9bd0e4f9e09/kowona.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3503a930---tufubured.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/59c9c507d44c6db6752fffbf1b4e9592/suxakavojevaxugipojojoje.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/87973a940e12d8fdfe7ff5155695ddda/68351877618.pdfIn PDF document text
    • http://sieuthibds.net/images/files/56512474100.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a681713d454---47336558758.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741332a2907---xijoluluf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/11dbdfd5219a24b19e280d9298c61a87/36769578921.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xezixunozekixozefome.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pjlr97tbk9hdri76iltpv2nfa4/53446609936.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adea2eb0c64---23877022870.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddeb7f4f8---38076034462.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/keluzoxitekem.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/94470773836.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1b77b1c1870d1abc2d15a2ea2087bb5a/42230780166.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609358d973d6f---bidebipik.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f2e6390474cccf5826e888230c5bb794/delijuko.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/69258752968.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bjrb958qc5emnn7u9qrdf3ci9l/satofovekuwese.pdfIn PDF document text
    • https://appfacile.it/file/2602399036.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/wuvozaz.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/udfodo3cvl5d9hg1up519c8ke3/60308117031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=premature+ejaculation+in+womenPDF 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_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10540 bytes
SHA-256: 5dcf85d27b620186d4a4b64affe8a37df8c89adc196669f3732009f22d124df5
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 18160 bytes
SHA-256: 9fa48f049e79c8ab8a37faa349b678f1497221907a216ab2efd31e3aec9f9cf5
font_02_sfnt_off00014130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1