Malicious PDF — malware analysis report

Static analysis result for SHA-256 27979a9ad6ed4176…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c78de7e6db12c36aea4631bbe6524497 SHA-1: 8287070a78f83cef5e4fbb170fdf26a0d80709df SHA-256: 27979a9ad6ed4176a417f0c7637cc824d93d3dfdf20a7f9a74e33c2a44ac3bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=character+certificate+format+for+students+pdf PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608931c635066---givoworadaxutudunuxigej.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539ed473e7---75263636769.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aed220f90---liravodubokolonumelukune.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160854bf8a3426---poloxe.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/luxivopineti.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9802fed719986a3187e604bf07a69b08/86584405982.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/muvarobowikuti.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/41615819150.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/td7ods6iokka1v7thgfbbr7ma7/8819087536.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gixek.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/24fdcb3f48f41b2d80ea0c1edfa91410/bojomexaxobon.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/molapufuponomobaxufir.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/16094727091.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210903170710.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081946635365---kukazamepafokidigip.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c70ab64db5ec0609a3cbc9f0ca248f5f/rilamamarajebem.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/joxumifadosuvunosawemex.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/25193689840.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kinuduxewirowenereruvut.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/4054513248.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/xekevenoj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92886e8a20---41762687675.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/paxeratezovijifepik.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/65871404814.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ronumunifadibakigitiro.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10972 bytes
SHA-256: 4ff46d0b89e91027e13f467c5e1bd015b31f1582d1ca3d7caec934a472037752
font_02_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 16988 bytes
SHA-256: 79baa7a58fde1bd0c8c786b5928a49963b3c4d89a693ee62dfc025fe58dee656

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