Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c1003ed5483c5f…

MALICIOUS

PDF

79.1 KB Created: 2021-06-19 13:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be1f9e17cfcf06635c5b68cff8126857 SHA-1: 6e3e6280d2bb68880552d645512b08e08418c4cf SHA-256: f7c1003ed5483c5f350368b66b4f732acc840eadce0da226e6058a7ae460ecdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=ppsspp+gta+iv PDF link annotation
    • http://jedwines.com/cmsCart//upload/file/vutezazativafiwuxidisi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/bufatigataxirukibatude.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jud4m9pgo5cjenfo1jgl7vskn6/raxibujidesuzoxuwad.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/228bb659594899aae91c235a8cfcadaa/siziwuxupudomebi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6677a0b0a7---63228796064.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc259ccd6---98739231804.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/11095b9223aa4dcacf7680511693d35e/61396455375.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/vonikonupelarazino.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/af6214d50c3ec23ca924e059e43b3574/4855646393.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f04dde5---4720797548.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fd71b972---futetugewafiw.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/jidalefebimulixufi.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nipivuvosamudawarorofuf.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rizar.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3e37c384---kivonelakeximud.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/xabuzatakevifavowed.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5aeb1df93842da60ca4e6d663ec7a81f/fuvavivimoval.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 4920 bytes
SHA-256: 7226abbd2b418edd79e1392bd098b1f351c050bbdcd7625350e821cd515b026a
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 11212 bytes
SHA-256: 31f26873f00e0bf3d568b2901edfe29db2ed981badd01af9c825c94bff16ae9c