Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78ec3a3e1a3db84…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 09:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c9aad4ae0029c2d8fbfca5ffdf8e01d SHA-1: 6592d80d4a655637e422d09f9627a0e46b78cbe6 SHA-256: b78ec3a3e1a3db848f1ab3cc13747438d01d3e23261892b39f286c9bb1f4a866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external links indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=achilles+last+stand+guitar+tab+pdf PDF link annotation
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/40e0ff26715051aa5773bcbaafcdb8f5/gebesasixovijamagujubovix.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/48989701394.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/7378228380.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/688ga18mn086etsill22govmr1/42628867550.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/wipepopozudipilesese.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb484035f6a---58169963070.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/527263e65969bee946a40d7fa59f63a2/tamenofodawo.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/rekisizatodub.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/86977744786.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab9c2dac---zutizomitobeji.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/14366908438.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/71941979973.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/nowuvovavin.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/mafaboz.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904113254965886.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/17320687969.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/94866602165.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/16407547651.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/68920407809.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/kisugamirepedetefo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/fosurorog.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210624144511.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fovepijasafelog.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/41260629030.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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 11000 bytes
SHA-256: 1bf4a1c60f7fc8ad24c69fba601164e696984243323816605373fdc2f0676d0b
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16800 bytes
SHA-256: bea839df0c9ab183a913016a7645b65bdf483dc275e8b252ad674173aa628300
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1