Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdd2d2fe787a03b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 14:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6402f380a8895313bd1216078417a55 SHA-1: 2bc45d80b8c1d87319e80f9966ffe8a76f84a04a SHA-256: 8bdd2d2fe787a03b213516e8737077e803b87bcc4d6b197f5b5884f4c27c6ca4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many on disposable hosting, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=how+to+backup+your+android+phone PDF link annotation
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/48273124424.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/70820810392.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/81227825687.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/xovimetimezelunoko.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lojakizabu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/guvogeba.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/baxomedebutinidozupofikal.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/53673256570.pdfIn PDF document text
    • http://identik.hu/editor_up/60926917214.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a602d3c48ae79698bb3f156bf166d9f5/lewezuwuniberarabob.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/lofozedeluxejib.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pujuxubusun.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161309dc134525---86042813217.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/57176512876.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/ralisidaguzagimugotevimek.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/85093415701.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/geperaburokun.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f2f54547---sodusuz.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/34932613792.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gizerajiselol.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/piwatulorevivawax.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10920 bytes
SHA-256: 279400059f583aace595261389c6ab96814b1e63cd3b5485cecce5375d1d898d
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 17352 bytes
SHA-256: 0dc7c684b9864f85e7537b0c8251073446022ce890b9f09d30e819360ca83d8b