Malicious PDF — malware analysis report

Static analysis result for SHA-256 702fe3e2f28ba090…

MALICIOUS

PDF

83.1 KB Created: 2021-08-22 14:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc156b8a70e0a8756e63a4f82133a688 SHA-1: 08d3c90f655465f62d2641995ea5dc540f62ddcb SHA-256: 702fe3e2f28ba0909d9575fb2ddeccad3ebb1e9e967d747c06e47ebf0be8058d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded JavaScript and the 'Password-protected archive handoff' heuristic indicate that the PDF likely serves as a lure to trick users into downloading an encrypted payload, which is then decrypted using a provided password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://friend5190.xyz/js/ckfinder/userfiles/files/zirefonozasumot.pdf In PDF document text
    • http://lor-rostov.su/userfiles/files/xibeza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b4a717a2f769d27c4a7d7ab19b215b0c/wedadogi.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/mupukimugisurewav.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f7f08d7f---26329704971.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4895c439337ef099fad16d2041db82b8/fabumavofizabikiboji.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/45433283551.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba1030570---58091805325.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e9371f85fd25938a8d15a406615bfc0e/dutotokajapafoxilu.pdfIn PDF document text
    • http://gtshotel.it/images/file/83658451768.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a415159e65c---sunigavo.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/puxofalodeso.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6c214c02e3e66bbd29e1de9bb27cfcf1/19409618799.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/puzosare.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/newerajelozuvifomovidugat.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bogitiv.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc3beb2be---71134780280.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d127255c99---86661869635.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/nakeruwunotibowez.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0d40a40374b8764a3a82f9f5ced15283/mogurazuwusiberam.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tafoziganekus.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zovefewudolajezomikol.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fe8d68c2---nevav.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2401ce633---zasuvofuvojaxobomamugupa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ba4effe---69266949354.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f5197d60---55287415427.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f57d955bda---godekiwizow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=microsoft+office+2007+free+download+with+product+key+filehippoPDF 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 11396 bytes
SHA-256: b85ae7999a15c37db0ac857b6f6c46a5fe793e18b53b43eda0b1f745bf2724cc
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 17464 bytes
SHA-256: 72113272d36fe4e7daaaf47c821706159e23d3ff367851601b47d642b01a9fc1
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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