Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f950e396fdfda57…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e3c1b0506eb7b6ec22c7ab3b99c43a4 SHA-1: 9475a08f3018762e663c6236403bf659ff09af2e SHA-256: 4f950e396fdfda57b5eb6a86b4b952ce4ffa8a7ef2650bbf8150e7377d5da90c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of redirects, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=talking+tomcat+free PDF link annotation
    • https://thehideawayresortpattaya.com/userfiles/files/45174716245.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/40263345475.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/17641601751.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/kifomofekomuviv.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/36499294490.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/41847321376.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/mupizubuwerawumozozo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/34242648044.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/16375440392.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/dbdff40e9b83f5c6757067421fc6ee66/12406668897.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/454106c315fe53d254edd28bca31ce33/88313229779.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/49420340675.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/mimasubaxukujoga.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/55596190857.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/22086819322.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614021af7ee2f---xilafoker.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nanixuligabosufeve.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/18677969927.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/39123609653.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/22315042262.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/parawukojamofatoxefe.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fuvumekekekevu.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/98606197102.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/52089401840.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/51696343583.pdfIn PDF document text
    • https://mavibusiness.it/file/2380505067.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/92793295583.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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 17860 bytes
SHA-256: 53d30c8c9a8b919f8e906f4c8fde4236a4f7d8807b158f61ad96fbf43af536f6
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 10568 bytes
SHA-256: 935ea14d1b86a4b8b03ef3d5fc74880ca78c6194642aab13e78150f793018069

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