Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b127a773384ba9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 17:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2460d4098b6e5563ecfc4d9635dded45 SHA-1: ec88415e7631aa2ee8c5e8e00effb28f98a62905 SHA-256: 57b127a773384ba91caf7f50fc3823b231f07ac9da6757fa684571f19577e040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=android+phones+with+itunes
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360eed4baa9---nofojadavegizo.pdf
    • http://garageanything.com/js/upload/files/27144598662.pdf
    • http://eprdel.cz/userfiles/file/68699838731.pdf
    • http://biafrapol.pl/pliki/file/suwoxofixijejawutabetu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b41258fdb---50380122075.pdf
    • http://angarakshaksecurity.com/userfiles/file/1071684541.pdf
    • http://daeryuhealthcare.com/ckupload/files/nemeke.pdf
    • http://agierresrl.it/userfiles/files/41182574391.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1092725690.pdf
    • https://deepex.hu/hirek/files/baduto.pdf
    • http://barcelonasixtytwo.com/userfiles/file/gunona.pdf
    • https://e-uchebnici.com/img/file/zurogegajabusokozizot.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73f0fd41---puxaburepini.pdf
    • http://izmirtavla.com/upload/file/30710322949.pdf
    • http://branpc.in/ckfinder/userfiles/files/wuxuze.pdf
    • https://bunianco.com/other_files/File/ripokofivo.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/felujawesil.pdf
    • http://marupi.de/UserFiles/File/53234082.pdf
    • http://chip-chup.hu/upload/file/44220624801.pdf
    • http://hvpeds.com/upload/contents/file/woxajuvevisep.pdf
    • http://baove24h.org/upload/files/98510455769.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin
6f1ea6ce9bf08840f3fae7f816ff13603b6a260df2a3b185b19440861bccf15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17556 bytes
font_01_sfnt_off00010058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 16792 bytes
font_02_sfnt_off0001186f.bin
98c45202eba06869a20017edef79464cb27e1df6aa0a330ac4c2383d24260795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 10448 bytes

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