Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fe34859dc7db31…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 23:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5d070b6349b713e742f4f080e35dfef SHA-1: d00c2c6de4a2abc36645bf1e42c9f1b10dc0a43e SHA-256: f5fe34859dc7db314ef7c3b21d16006f160884dae3f5333ff005bf3e9b590f6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful content, such as phishing sites or malware download locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 https://resortweeks.pro/userfiles/file/11301669126.pdf In PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/tekigetebatezugekaro.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcedffa37fe70497214d5f386a2cb88f/fegobekaguzudodap.pdfIn PDF document text
    • http://m2m2design.com/userfiles/35282019260.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb65406f79---dudojiru.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136be135f216---30487125098.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/juletezefofapokejixi.pdfIn PDF document text
    • http://imbirimbir.ru/files/80819708006.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gepunire.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/245875305.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/44482724665.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/68249962917.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3210jbjl2nd9970rpiag9568t1/74175458719.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vesaderuwapojotini.pdfIn PDF document text
    • http://mextro.de/upload/files/lomamafud.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/wujupidezikag.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/ponaxavolatadigok.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161378dd798eae---lixijitumalemokejozada.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gaputezuxe.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kadepewakobibojelijewi.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kugozojomufazowanari.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903055353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=clash+royale+free+emotes+hackPDF 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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16292 bytes
SHA-256: a8ddfd0760d4d2bbc0370d9e0d149f0da4cb3d41f4925ced6dbccd823dbc8135
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 10644 bytes
SHA-256: b16ad883d6f629bb4b35daafc43d1de94f6a69d5b4df3ceca08f041425bbbfc2

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