Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fefe7149c810af…

MALICIOUS

PDF

76.8 KB Created: 2021-06-20 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 686f6db757189f57006af7ce3b9696a6 SHA-1: 03c983807eefeab76b4ddbf7bcb6c5c04b2fd4c2 SHA-256: 43fefe7149c810afb3e00ec4d10a7b5558a183d04de744b9ceb48cbddf8fce55
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=convert+litres+per+kilometre+to+miles+per+gallon PDF link annotation
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/0e1c01738c7a4d59916afdf3dda87396/61727976448.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64c04f6dc---42863927516.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/170541502748.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0m68kpdn2trtrn4k3m3k20e032/fojonirivug.pdfIn PDF document text
    • http://thaide.org/userfiles/file/toxafibomojewuriduz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d05ec4e2---8217016124.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa274053b5c---77321711968.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5961b4e7e---55583990614.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/38d83ebc1f4fe96bb5d295db0f194b5f/bafefedevizavizumuxex.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3f4b0a6c6963124b7f38aaa2d4012708/bitiwarilenezeben.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/48260808528.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/63900969311.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zejosogapazesa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/uoumguqjbnr075g7kggfvrd4p0/73213422188.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/62594224527.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/87936510397.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/didegusajinuzenukofiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 5072 bytes
SHA-256: 3985676169f9b59687ec79ce6c2382563fd43153ff311a703a1cce9fe50ad6b2
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 11680 bytes
SHA-256: 714ddc15da8d1925e701800d8aecd431bbc27fd1e9b8759529855cb462633dd3
font_02_sfnt_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378