Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3b3e3666bbb769…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 06:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ace479bbb6d6a9d42703e3917b625cbd SHA-1: 5d76bf7c127ef2eb4f304f10f8fe5016de1e3a64 SHA-256: bb3b3e3666bbb769302bf37701ea904820f8c89d84abd08dc76e5c39366b20f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. The primary intent appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9bsq78bn40sgdr9f8078stgkf7/xukepekotuwamujalozubiju.pdf In PDF document text
    • https://aedwea.com/upload/foto/56197584491.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160caccf6a11cc---9206228235.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9507b3e88---mosovitezesavumis.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g21sa2bv42d8mk06eh5c3dgtg7/88132344892.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608890bd1fe53---98285026473.pdfIn PDF document text
    • https://soechi.id/userfiles/file/51151160020.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/gopevijigutowobogeraf.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d4946ece155711abc73018d16a301ac3/71778133781.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bigivolijolokotovodulafo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r5uhi8cdurrog3gjdlorc4clqq/fufilepuroxo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vewixikuwisukivejodu.pdfIn PDF document text
    • http://jfe.hk/userfiles/kazogowe.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/kifosaxago.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d180af45---ragidunaxazan.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af25e6add4---kikifinezore.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/logeganebamiw.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/gajupebefi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754cf828400---didorevadojawu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/54357895028.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kopixamomata.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b27160d45---92774214146.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/91020277138.pdfIn PDF document text
    • http://distributoram.com/files/file/runekenopoto.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096c79d81b98---tuderozorokutazeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=advanced+copiers+and+printersPDF 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 16384 bytes
SHA-256: fd97c1c936ba752571c3e64bf08640c88609f368f337d945a6506e1a2f3638ac
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 10508 bytes
SHA-256: 4acc459099581a89ffc0be0e49de06238f9d6a48d5143183477dcba38f111546

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