Malicious PDF — malware analysis report

Static analysis result for SHA-256 0390c6f7e1bf7b4f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5f8f1cc19c71b1233b95f6bc7ae2680 SHA-1: 95e295a92c5098a35a048ea0790fabaec5726c7d SHA-256: 0390c6f7e1bf7b4f766683472f8f9d8c0e57f3a43ea390952a1fb77189ae5f08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://lycee-elm.info/userfiles/file/19413377363.pdf In PDF document text
    • http://bhttourist.com/upload/fckimagesfile/givewula.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210903011947.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/42000955576.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sowekur.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e605ddbc9---39063150505.pdfIn PDF document text
    • http://hybsch.it/upload/file/gezuxibafekewodivas.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/luzugoxalupik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613febfe8555d---ramipojogibig.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1f7b9e2---36053047196.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/razovo.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/bipakowinetakokar.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901083037731431.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/7800765466.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/buwugukotipikiki.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/44cada170e742860634d2ebffe797814/85028888992.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/89050972422.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/77394628422.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/94260571110.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/neranarigalegogagasapaxe.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/pesanogimaxifiguji.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/79095155985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+connect+wireless+headphones+to+android+tvPDF 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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 10756 bytes
SHA-256: ef02c4c95b1efcc8269fed5a02e421e02ad1b62d5783c396cefc29536ceb174f
font_01_sfnt_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 17056 bytes
SHA-256: 2ed6fd57631b442a73f0975dd31fdbbc0a63f0d5977895498c8ad6da2a9c5f69
font_02_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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