Malicious PDF — malware analysis report

Static analysis result for SHA-256 944b99e317fef585…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 02:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a852c82912a6a26b0bf4c566c66b746 SHA-1: d5c18fc0388cbc7c49c418218dba7c7145586630 SHA-256: 944b99e317fef585440eec96c4096ee9114783a7bca802365880e342c5c5bfec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://a-b-i-s.net/layout/bilder/file/videnekujamorip.pdf In PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/494646083.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/dozelodelofu.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/bulazabanisopudadopazup.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xefubesonokizumotok.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c7325bf0c16858b334bd45f7ba576358/sewanonopuzivisoraxomaven.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nepuwadikog.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca222a152---dititaro.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdaa2e911362282c2b9f75d471f76f45/demoxiregaku.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/zukibibeta.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/34188437959.pdfIn PDF document text
    • http://smirna.pl/files/file/lebenetirodo.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/60119471235.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zovetalabarorokas.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/monudazux.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/90520873783.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161376847808c5---sufobe.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b8b72aa---kolozefojufu.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/7454666322.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/tobobopomisofopazavowis.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/67199256801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+sa+no+root+apk+free+downloadPDF 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_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 10616 bytes
SHA-256: 00d25523a208fde60d5d81f1c6e158b7c4501449f5598ef3054c82a1888f89fd
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 21032 bytes
SHA-256: 17d04b4d4fe42f5bc2abf4f774dc64b58e3ab491193a4497de70a6e976c71176
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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