Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a76e89ebc005df…

MALICIOUS

PDF

89.3 KB Created: 2021-08-31 21:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b9f55305762af9f465d3cb79a66fd423 SHA-1: 0152c9b57f71a3543dc7e870554a5375541eb24d SHA-256: c7a76e89ebc005df1e1124d780300598b27b0bcd30568b371b4f12e139aedb1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other domains, likely serving as a lure for users seeking game downloads. The PDF's structure and embedded links suggest it's designed to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kaupa.cz/userfiles/file/xaneti.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/857d1285a04525cb1005ca8d30d1deb9/sifuzusuxir.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/93823969628.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pf02537c08j2ade11189j0qboa/34673518522.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/46322456233.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd825ac536a96863e2f88db729d3378c/lugekabaja.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cd09adccecfda5f5d4ec44e315481ca7/67776467945.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609072a7e4d32---jodalinukurababefa.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/dinaledozop.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/q7ill2e3bpb7i2si92k1n9igml/98131467671.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c880d6a25a3---malotarogukifidit.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/xesewokimineranebadene.pdfIn PDF document text
    • https://ms02bet.net/contents/files/sufowaruradovebokedaki.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210524093356.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b37d6d5e---lixagizoda.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/52366743623.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/6272360962.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/11830987231.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dixobapaw.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780ea76e682---xudepozis.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/jawikotugejevazoroziwudox.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210803054357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tom+clancy%27s+splinter+cell+blacklist+free+download+for+pc+full+versionPDF 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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 11376 bytes
SHA-256: 82f7af198d079eef080a25006faf4a6e5e9fce3352b1e9e3c06afde4e338d9e5
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 20404 bytes
SHA-256: 002baf2c08c11b6b51eedeaf0132f4f16ac366935626c918c8e758b82907de94

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