Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cc4917c6456f89…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 02:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fb4d582afdb352dce135d44ea51a91c9 SHA-1: 2742eb863364b0cba8f9c3ae6ccdeeab94aa3a01 SHA-256: 68cc4917c6456f89d7b128ea2b8e50f1a63a7ddf165ab4bcf5e27466c4d19bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ed15a085cf32bf775528f74f4972aa38/nubavetogajotifegele.pdf In PDF document text
    • http://normel.org/files/upload/file/86696386984.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/7160427848.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9c614a1---vuxomivipigibuva.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a27409e7182a5b5ad53a0e5d3ee98aaa/ripazevirar.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zasosibulurovu.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xegajotoraz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ad6b812d---nusufidasuzuw.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bu49ql32080q8f05o8osk3nvas/winorabiwitovigelu.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/19070952500.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/93379346142.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/54726871857.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/29032197461.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b11940e4---murigisotajot.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/68050528758.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdab886be---mololisesa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/545539e0759537c70730c118998253ba/laradoronugef.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/gefopazoruw.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/dakukevodar.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/14000718518.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113e476f2095---15174494227.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/98108561530.pdfIn PDF document text
    • http://coumert.com/images/file/30211565424.pdfIn PDF document text
    • http://waterreducer.cn/d/files/59873468020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=la+dispute+marivaux+pdf+englishPDF 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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 11052 bytes
SHA-256: 9b6d78a57e03f05d478031a6bac0a914288a1d903995f409a9e41c37e5efc559
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 19984 bytes
SHA-256: e9fb11f6eaa36d738d8f96c467b3cbbf3123420988142b8a528b9a01dac019e3

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