Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f0484c5edd5bd…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 13:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 097125f9ec17e3c88c7a25f09c743683 SHA-1: e6fffeedb6a240bc4f468d99cc471ce325af27e4 SHA-256: fc4f0484c5edd5bd03e3c2442973fc666f7bf202f1766e995434fe1685163ba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an effort to obscure the true destination. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=call+of+duty+ghost+skin+for+minecraft+pe PDF link annotation
    • http://ruishikaishi.com/upload/content/files/2021/07/20210718163006.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/morulepuzatedaz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d17bd70d87dfeab1c8fecd54cc0b2150/xesifuwuvatusil.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/xivogowixoledes.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c7a017fe6caff6fd8eb5dce7b8eb83e0/17881316625.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/utb7v6892jjhteegfm2m95bjd4/sabuwiremotu.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/farevotav.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/55671677449.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609307b051fb3---46084519830.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c4b05271---94876114424.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a698570fdb2---78533781053.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hj1dj1t794iha6cfcn8vt3cgh3/75307679783.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/4054372723.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/zizimomijewodepu.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/powel.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xegor.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/xovujelibuwejij.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5l0e7lksiou9be9aknrriag3c6/22750679233.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/13503421414.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/rikojijafajuruju.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/lrm65u2686briobdhato7tejdh/43217618206.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e55ab78c---50095601081.pdfIn PDF document text
    • 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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 11404 bytes
SHA-256: a9d1d4d58d6433b764f80c4f4a4ccfc8cbae731d79a2b48d8cd0f448da60fac4
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16972 bytes
SHA-256: 46c2a786dc02d24b101eb7c44d7a42d84e6ece332583f484c2a86f91fbffa219
font_02_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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