Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50c8c7a3d6d4d50…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 18:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef5a5336aabab6e1c24bb7c8ca502a5 SHA-1: 5817fc1b68924a5a27f747a44d981ede614275ad SHA-256: d50c8c7a3d6d4d50379954c9b26317dee86c6201d403a7c1455a4934a3d28c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the redirection or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=nice+words+starting+with+a PDF link annotation
    • http://china-spec.ru/userfiles/file/zirumovefinas.pdfIn PDF document text
    • https://vitanov.rs/files/nirunolarazubijipokopub.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/sitonuwipinisobitev.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/21536530205.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/62351916066.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9f67b59d8e2f66e31d03dc2116428c5a/pamumafakelunidamobifo.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/3228346840.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pudowodivejit.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bajuxavavozibozetur.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/faxiluromixenaxumoxiroge.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/mubonelupu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sobezutevusobefowo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/431c8e54ba4478ac14556d06fee6d163/xanaruzavofulukuje.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/jenitado.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/81476809369.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/bibatazanugokinor.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/tiladilopizolo.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/malutovitibu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a11544cf---kalukakolajimulozotib.pdfIn PDF document text
    • http://askort.pl/Upload/file/97740279847.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/dinos.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/66172845205.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/21224015020.pdfIn 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://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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 17584 bytes
SHA-256: deab1e3081c6311d3bb0e583141692984cc55b55cb3c18b32871870f48a7c131
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10668 bytes
SHA-256: c1e43a732c68aa9f7eb0a3241720eb3add48e068ceae1802cae3da3b5ad53e3e
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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