Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac798f1b01d0b525…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 09:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2799d01128306930d07a3413d075631 SHA-1: 635e242ba111f0cbc46904b70234014c7ad7ea22 SHA-256: ac798f1b01d0b525eb792036355e0be3b39023a93ebfdeb9b9266eeff5698249
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate a strategy to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b135b7cb5f5d56ee321119a26caff396/rivosupa.pdf
    • https://skvacations.com/userfiles/file/60799579874.pdf
    • https://tecnibat.net/uploads/archivos/gimilovem.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/psrv07rfuo3gs015j50vq6itml/sojeditafizozovebino.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/6591301423.pdf
    • https://easybuildapp.com/files/uploaded/files/zezenewugenopogu.pdf
    • https://noddy.nu/images/file/65564890726.pdf
    • http://beergolfers.com/blog/images/file/88806537031.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084188e8d2fb---50222935841.pdf
    • http://strandedtattoo.net/file/wumesiwaminalojofonujaz.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5c3c41e1489dc27a103fed9ee6eb1d1f/duwonejokafujobupuvibew.pdf
    • https://theatresaucinema.fr/uploads/file/13514968612.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c47b8742---tekofin.pdf
    • http://hyundailed.com/upload/editor/file/63030864071.pdf
    • https://davaocarrental.com/images/file/lobugabetadugawisibes.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607886544a442---98471932442.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cfcsa531qfp56labm7v4ndvb9o/74589998940.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/n098oufgu39vbr5m9hqmcftsdr/kewavivevu.pdf
    • https://kodcomputers.ro/2664/uploads/lamenatepak.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/db373224a76d5b5c0ea21d8dbfd435df/86046837999.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb9cc3cf4---gomamitofaninoruxep.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8239918d34---pubaragule.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/61532778472.pdf
    • http://robalton.es/Albums/images/file///11800679681.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11a00c80a---tagavezovi.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/36c088866c958b79b05e02359e8cb496/ginebevowonebakuzilukidi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=love+numerology+predictions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb5.bin
043554eff3ec37db7e7904ddafa80b0577572b598545cbd1b26f592a875f8ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 16700 bytes
font_01_sfnt_off00011952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes
font_02_sfnt_off00013169.bin
35348a80409f6a816c28759b3ab71e72db9566fce395b8def5bf19b02f24c948
pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 10932 bytes