Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c515abfcad78d3…

MALICIOUS

PDF

70.6 KB Created: 2021-06-12 04:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e8383da6a88b0a5361838ccd54604d7c SHA-1: 7f2e55120cf648622b597fea5cd4cfa7bd516462 SHA-256: 93c515abfcad78d3b4cba31c6f0546b6e395dd8278b1890bb021c0dcf8fc8b4b
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that redirect to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=crt+tv+repair+course+by+humphrey+pdf PDF link annotation
    • http://olgapolyakova.com/files/files/93355368261.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/38ff2a04fa6aa0260443283f40250147/sufanadifopijifosixalip.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6b292853db23a2a89497685de485e8f8/74447479742.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/41c31535e420a523d50674ec4b231b35/tapabiboledusadipoboju.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fe6c729abbee3e7e2d10061a00b69913/dolabokimubododaga.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b9572cf7b544dde1df16e76a4805bad6/zoporoge.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qdelufefva3f42bdaj1l9k9v01/jewadosuvuzazikipuxebax.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921fa0a2452---11196966029.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/57cdff1652046b1fd560183fa9c2a7f3/15400391984.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fvmf0miqqtamsnv5s7eq2vim62/kofuseditapixejunob.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/ponuzovilonela.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wasimavozuwidubomuberip.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/6169534035.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4ca7bc7f520fb5b601fe0352ae9a5d7f/74060363073.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/df736a86adb441f2a7b05d5067fb0e75/90549167734.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7d9f0a7f---36295403637.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 5568 bytes
SHA-256: 5a2fec08b1ce1597464bde3f13fe692a0e6269d255e071e1efe847eace0fddd7
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 10596 bytes
SHA-256: e05583bdb8a360fcdcb88fc3ca9f5b977549602752ee127aaf5832095439f0bd