Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e1344ac2a4d53b…

MALICIOUS

PDF

77.6 KB Created: 2021-08-13 06:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 137a7c183f198c6372b2401e0c64972e SHA-1: f611fda7a9706f0b8198b6fe3ac4f66512f80a82 SHA-256: 77e1344ac2a4d53bb25ceafd4de2f57d256fa5811a5d74cff9835c9e2590a50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or phishing lures. While no scripts were directly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9kujqeklkll3faud4tk0j0ugp2/18971040717.pdf In PDF document text
    • https://btcauction.vn/hinhanh/file/vozilem.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6edec7c551---daxajufejimuw.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gngqp7suebd2s4v5l7dbtlp6p7/32973309499.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210812072550.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/76657407882.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/21360635740.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ajg3kogn2j7t7nonkp2aust16c/61582394823.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/kijinefajetonam.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e21087133bd---79823370127.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2006117dc0f296a313745a2371de9306/kifomo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/69u6tj917ped2g881juo24atv2/fovenizefew.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ecd6bcb95---76297561207.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/17512504785.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/95665814762.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/26476607208.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ede9b0912cb---larufigi.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/37169477209.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/muwamupijurozipevukegijo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16101370ba9821---17797846300.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/vufopitijugulesafibamater.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/07787db836764b67b34aab12c90c5e31/nazexisorolevigorik.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/xawiwodedawifexixexule.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f344b62880f---31073916795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gu%C3%ADa+de+estudio+nivel+medio+superior+ipn+2021+pdfPDF 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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 17144 bytes
SHA-256: 3a80da71f6d823d31cb55019aa455bd7d5c209afb34d86c9000ac8d33ea2ba44
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 11220 bytes
SHA-256: 4172378b6b287f58367438df78d6a2eae1f3847e956fc2b94441128447a8dda1