Malicious PDF — malware analysis report

Static analysis result for SHA-256 7367abfaafb1aeaa…

MALICIOUS

PDF

86.8 KB Created: 2021-07-29 20:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 24ff3eb9983b82d104b0287a1c6b8f64 SHA-1: 02341b30bf784c459601953be9d5d52a076ea18f SHA-256: 7367abfaafb1aeaa67582ca1de66d3e12b158072ddc579e45ed01c631a350106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, and one specific URL `https://krisoc.ru/uplcv?utm_term=new+hollywood+movies+2021+hindi+dubbed+list+download` which is likely used to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=new+hollywood+movies+2021+hindi+dubbed+list+download PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a67dd5ee88---41206100169.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09fa6cba1e---76870281554.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079225b5097f---89225470138.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/mowumasapuv.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/kamakovofibakitugofig.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fabdb35d99fb5b4fbb016874eb2822d4/tosujabebufivi.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/67317839288.pdfIn PDF document text
    • http://charivne.info/images/file/gironaralejiporex.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/garewafobakururikefubakek.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/98284063377.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/xovuwutogariwesegapijokig.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a3lf8fg34sok5n96fmhvo17hi8/femituvizofazox.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kowilidalelazunafilesi.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/86954479855.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/60607882648.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/belitozadigol.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abdcbda0beb---20636336929.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0eb6fc846085931265b1e9b546d9c291/38082704033.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2b1decec---77432200181.pdfIn PDF document text
    • http://amandamaitland.com/images/file/54550798563.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69230a3f54ec26de09d525d11d8ad761/padukadenemogu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/15597937707.pdfIn PDF document text
    • http://protok.pro/upload/files/71878264406.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0po8bhkvjkoq9c6f0t0bki3bm2/76399283103.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f3ed42f75353f11ba65f5ad1426aea46/37098778318.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 17248 bytes
SHA-256: 6228fe8ede0e613f6b0cc57271a924d5e20f51405eae98e38db8bca9aedb9f18
font_01_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 11192 bytes
SHA-256: a0ca2d71909265c5756da7355fc15909715a82fe180fff437242fa3cefcb0854