Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72fb04658154d0f…

MALICIOUS

PDF

85.8 KB Created: 2021-10-13 11:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5fea247ad52ffdc81e3619a798f4e215 SHA-1: c7e92453ab4c3b68da314448ffd4cdcf51496d3a SHA-256: d72fb04658154d0f135e35a678fcf03cb42c53ca20c21716afbd82e4dbe28c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://istanbularicilikfestivali.com/upload/ckfinder/files/1667857020.pdf In PDF document text
    • http://kgmda.com/upload/files/13069670086.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161622108ce37c---botoz.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/gukukobexu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1616571625b4c4---repuj.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/24122693249.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hnbrfs9lmg5cb6fqkk4rf4kh01/58268935857.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/92865797262.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vuneda.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/xopurolajumuragalelemijal.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/dafevid.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/88806311069.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/niviral.pdfIn PDF document text
    • http://veitali.com/upload/files/saxisuduxum.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/vuderuponed.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133888f1fed0---61502502859.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/32418876943.pdfIn PDF document text
    • http://kezheng.net/Upload/file/xezofodalaxakawa.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/27286943337.pdfIn PDF document text
    • http://fourfoods.com/images/files/wajodosamukipozawenadov.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/nasasedekamelufebatu.pdfIn PDF document text
    • https://qkon.ca/images/file/duliguzemofob.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6320f60336aa6155e346341a734e3566/62958388280.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/38028759826.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/36321788674.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=may+2018+suggested+answers+ca+finalPDF 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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 19208 bytes
SHA-256: f019c54fdc73b3935cbcd3329397378fb0ae8b08669b040ec6fd63bf2855c6aa
font_01_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 11328 bytes
SHA-256: 2e24b3387addcbce96c681f54cf67c31eb8aa245ad49124aff16d694ec8e4ce9
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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