Malicious PDF — malware analysis report

Static analysis result for SHA-256 790e198dafed8998…

MALICIOUS

PDF

68.5 KB Created: 2021-07-17 15:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 50b35134c80a691a5880b9dfbbdda99a SHA-1: 15067d88928c8b794925446f8f861319efaae94f SHA-256: 790e198dafed89983e3cdd3d152b5b5059d749a7873e17c0d75b5caacc16f154
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. This pattern is commonly used for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9rcaufhs9t7mel61058t5ru4o7/29203249815.pdf In PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/91911057070.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b52fe002000dbcc4489253d814fbf665/17049363985.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/23374728000.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/sotamesebebugimexuvumek.pdfIn PDF document text
    • http://flomojapan.com/upload/files/sebelera.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/76378590376.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609001c22ef16---73617348576.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a6c4baa6---jimokulen.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160709e13a6053---39854288617.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/88589689420.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/mulogidonizejopasi.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/rinewuboj.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/64016162338.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/68921838980.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/19cc9c218844e82b51cb2c15b39b09bf/66894077829.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c57da807979---53896147529.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/1001712108.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb92263dc---jasolosifowefom.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/namivixem.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o93invcf8h5s51lrvvnplu5se2/volisalimipiluwewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rh+a+positive+blood+typePDF link annotation
    • 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_off0000b04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 14364 bytes
SHA-256: d34ddf3aa0eca9d0368e98407e6dac90f767cdcdf40b2def4fa3dc73a80b7dcc
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10652 bytes
SHA-256: c31cc4535c635fefaaa8f5b1da6e97a85e00d9ff6edc23d8ebbc026652ca0988