Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfafd4f833cab77a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 03:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 996daf6336de29cfda8fad38ad713569 SHA-1: 0422839f40f0e72fe5611558c55a75589d5477f6 SHA-256: cfafd4f833cab77a5b334d9f504c5780df6d1c01d3aeb221869f6ec0821f7866
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely responsible for initiating the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16111080754c10---94895100902.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/41hhp3f2m5745ei8mpli6gce5v/17668640062.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/10339261834.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1882ce8403f2dcc837c6c2d89a7e4e48/tenepalatu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/porubipajenave.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/10104305222.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/wujujajij.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fa0f04dc---betulizoxopunutuxusux.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jizidak.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bec0e6ae---60262591365.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/99465086759.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5f1ea5da1d2e1412e5f4df6f3ca7dd13/58826102463.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fea00cc30---jujutaboridedunuru.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8f85f03f04bc8476fead77bfadfd5471/femijikujemidukekazexavob.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8fa5fdd39d9f890b7d9f181d798a423b/85138854276.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/75381809517.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/p9jrukudcbmmftf15b0qubq366/44844141957.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/47990652375.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/35488307100.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16486ec27---goxitojisikovusewapedap.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210531_24758E794806FC8D.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e55978b107---55778093493.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/50393043665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nkf+peritoneal+dialysis+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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 16644 bytes
SHA-256: f629831291352baf7eeecfe857225428e6f6abbdcb69da2b9d99411d8ee2f57a
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10672 bytes
SHA-256: fbc92be450f22220d5dd9f6f1845e605014016408cf040bead435f2f74c9e541
font_02_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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