Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661527cf55414fe…

MALICIOUS

PDF

88.3 KB Created: 2021-08-27 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b1ca8b0a883b48777b9841761e5b49b SHA-1: 662980b80b7d61ea36fd3933b9dcabfa870631b4 SHA-256: f661527cf55414fe3760b0f70d108d794e15e8383d568ad8f36c3d94e7fd0522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://myhomeinparis.com/userfiles/files/rogutudi.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/lukikapuduludiwuwefowiv.pdfIn PDF document text
    • http://terminsk.by/pics/files/34773134210.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd07e75a57---jeloget.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/xosalewirilabazapejikemab.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/11975486905.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jadomilofujabed.pdfIn PDF document text
    • http://promador.pl/userfiles/file/duxuxogejogekajomit.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/lezosejibum.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a738df5e156---22978239717.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/42765286147.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/19954199920.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725b631499d---lifuwaxapiledoleteteja.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608013fcb7df9---4869266149.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99b907ce5---42218395212.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/84461553081.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/35423465967.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/13587793840.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/061ah2cleqil3kscdkoah744j7/supozol.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/xozeg.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983bb594ead---10744165301.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/46476308695.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4aeb59c59---piketemefugevepamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ask+not+for+whom+the+bell+tollsPDF 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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10524 bytes
SHA-256: 01663efcb35c58f322575e74db88e7fd41076f768c7d10b993df245fa219b7fd
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 20800 bytes
SHA-256: 0225f2ca426ca3380ca61bdb13f94f6f7dc4c7da8d6808bcc8c47627768721f0
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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