Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e819a4e5c9ce7f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df262e8005b69021a9703d5b24b0ab14 SHA-1: eda991a2760363dcf0e5069e4725fbf5ba3097bc SHA-256: a0e819a4e5c9ce7f21d9811e5589af42c521ceda62aeaf6e8eb0b7b2891f12a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs indicate an attempt to lure users to external sites, likely for malicious purposes such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=physical+chemistry+methods+techniques+and+experiments+pdf PDF link annotation
    • http://laros.cz/UserFiles/file/lirunitagegesefegi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/aee0500a7c82595345656636a66ede22/33455956040.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4265929c6---fufik.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/15123663428.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xerukudowan.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071933081778---87018388983.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/sitikedibiwitusaju.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/11943380185.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/37394438571.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26603b1dde---vamufavavulezedodiba.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wakikipamevudinumuvaf.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ac27991860b46adf801c30dfe0f785d7/kodidoxo.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/peselobozutavex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5194e427aa459e398610b1252849755f/fizawovaxalimesaburev.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082557caf7da---33348902195.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/16284062285.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/63931102078.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfcf7bb8ba08e317ca12f378d2dc21d2/37838970041.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejjg1naooonevaubi6e4fh1qjp/dejefukaju.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/53074118081.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/56fe32aba15018d044a55708588acf32/68924280745.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/e98cee4caf965aaff443cb2ba1882506/puzinem.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7e0a78ff6edd2a10b624c6ac4318cf6b/92037402546.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/2782740370.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5a19b15f---lutijar.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 17200 bytes
SHA-256: 6e8af2d4a95825a2387179311dfb5a2815327abcea0e3d40a9e74a82af12cd4c
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 11348 bytes
SHA-256: 5b40d1745f2c4ea05858a14d81215131b0395c6d68d411ff36b7d7df45d4ed4d

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