Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e96e76ce8b6aaf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 12:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fcff21b1547baf1dff22938ab800959 SHA-1: 8358a0796ccc9d9557b5120f79b6c71b3d42982b SHA-256: a2e96e76ce8b6aaf2b8a9ec9ad6b542b69e69ed574dcc9b7ac4b65e1f4228889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads, aiming to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ukmalayalamnews.com/userfiles/file/89700551203.pdf In PDF document text
    • http://majortaylorride.info/images/uploaded/file/89642975892.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/022f3a378dc70b731aefe1ff8328275e/58594285771.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/webebapejitizi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132619ccc141---wiwojeruvaragi.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/63009983216.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ba6351e723f4feb7035ebc5a363add06/meluvototibidasapineworal.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wuzorenovifenajute.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/83653532048.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/37779037352.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/92976312348.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/oe0006sav5su82vmkk4d45abni/80298169152.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/93570498166.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/99795932512.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/bidajubigofosinupitiv.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/82350722129.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139418d1cfa8---31787264988.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33ea68af---30201769810.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/6841271668.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7f040aa0---nakebijara.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/tidovip.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/vedev.pdfIn PDF document text
    • https://goodline.by/userfiles/file/43308871446.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/30515675439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=foto+corrotte+androidPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314031369609.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 17940 bytes
SHA-256: d9bbb1ef348ce5fcd8ad673a43befd7a063d602845326a7e497c4487eeb54f81
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10128 bytes
SHA-256: a5c742fefc3f1ee7220e0f5f0b61186d2fe332a6d1e45e7527de08fda60bdeac