Malicious PDF — malware analysis report

Static analysis result for SHA-256 493eaed7e837c4a9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93b42e1ae8d836af3fb7defd432b3651 SHA-1: 2d83ee3652c2d6e3b51846c5134abe2837079116 SHA-256: 493eaed7e837c4a99d5490d940a11d5f6dba0ace015cb90673f7a6d3786f652e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories on various websites. The heuristic findings suggest this is a link farm designed to direct users to potentially malicious content, possibly for phishing or SEO poisoning.

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 http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb2a8fc8d---nufejam.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c05b11492d9bafcc7d136803e62929a6/tolinujagajisulerukena.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3143645fea---lorelatojibotavuwogeze.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ce6d2f188143232940b72c4e4247bbbd/14969690857.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ga1q4qttr930s733ng35ef51v2/pezorujilozedudenelemem.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7be4b5d7e8ed3b7961c461013d61e318/90511245761.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/32691098953.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/gedunuritulafizig.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/5841267964.pdfIn PDF document text
    • http://www.asslar.de/downloads/21772074698.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe8c3c776---40760360437.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aca2378a020aedc4cafe9b3e89b8bc3/zusol.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/57788056302.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vaxakizegerabadaju.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b40ce99ac---55471099267.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b96f2fee5327788b98bf0a185091cb4/51850323982.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086507a01b9d---tevatasodipajuku.pdfIn PDF document text
    • http://camwater.org/media/files/22841552760.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nkguep5polkcpbtiitpjdaiih/48516441303.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c931b86c0c8---13129136560.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ee13e28beb9953f2e5febf5441be1a48/buvizokawi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/735e864dbf8a973b20b889d4688311f8/vozuwopesenevidadej.pdfIn PDF document text
    • https://csn-alliance.com/data/files/rurupav.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/73660077965.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106251147234918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+draw+cute+eyes+easy+step+by+stepPDF 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_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 16460 bytes
SHA-256: a98876d0ad5cd7af6f1b423aa2fac46f399f12b94dae1b8ec020bd967679ea1f
font_02_sfnt_off00013242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 10696 bytes
SHA-256: d1f740a404870a56bc657b3a9f7ea65a94b87c4a05b101bdbcb81718377dc2e9