Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca97cf063e4712e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 05:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c3a0e175fcde73c3d3dfef4f8d37523 SHA-1: 2604d501eb24a37325e0f400e701c1e7fc696031 SHA-256: 2ca97cf063e4712eb147bebbcd71116e3d1a672d3441b972cbf8011f07f6f64c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it is used to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e8953ba4---60418609092.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/76836794323.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/659bbda8c4f8588279b8696d4ea227f7/60568901119.pdfIn PDF document text
    • http://eko-uklid.com/files/file/42789720760.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/32381784099.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1282e76bc---87870517235.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/22638342457.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bb23b8423---72238932989.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/74822992621.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f10d0a706f0f65bce62c238ce20aea33/filegizikigezegudad.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094efc8ebfed---96180783607.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b622bd250ca38c3eeb07703a5135e078/lufeborisum.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609819bfee85a---71951773219.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/85142802952.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fce591c16---pavakokaxibalusexupesa.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/94404160871.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/45742553463.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gurul.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d96e78366f3---85770102789.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/gisusujosenuzetitupo.pdfIn PDF document text
    • https://avela.md/userfiles/file/36772377116.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3f718d90f53ba5294efc3cfad6a3dd0e/53975884240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=couchdb+manual+pdfPDF 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_off0000b97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97E 10564 bytes
SHA-256: b5858db293bf73501ad8f3b02ada9543b8bde3fc19cda510c74eb99eb54c7b6d
font_01_sfnt_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 15972 bytes
SHA-256: de11a8b430b9c827027a9ec6e9bf3db21d73470645a22e96694ad549b10c9914

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