Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d3cf9a258dbd53…

MALICIOUS

PDF

111.9 KB Created: 2021-09-12 05:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c57c7843f4cf462e2b7d0a9d4ea0936 SHA-1: 578c0e4d80012ed71238e938c7439d2edaf2cbeb SHA-256: 53d3cf9a258dbd539634b64376c5711800a9b86ad8d576ce147d6483a51c9134
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a ML classifier and ClamAV as malicious, with heuristics indicating it is a browser extension installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggest a social engineering attack. The embedded URLs likely serve as redirects to malicious sites or downloaders for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://cofetariafraguta.ro/UserFiles/file/ziwatebudamalabulixev.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/lomanibutewobavage.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wimarorirojugonaxokatisu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161386db885f56---87316851292.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/81758362080.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/seribudolosatawa.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bavolijerirageteborajugag.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bivuzaruzisutuwemifovesu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161351d9231ff4---mevufiwakole.pdfIn PDF document text
    • http://gaudi.tw/upload/file/beripisedepubupifitisoweg.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/8680585629.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34d17f717---43915733060.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/siwebumogigagejovel.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/suwaxulen.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tikokipuvakikabanox.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/28662998645.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/78511480856.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909015702382620.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tesasararuj.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9bls2adirpj4f6ie0j6av5q81a/89656960322.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/bazetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+may+update+2021PDF 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_off00015113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16925 18000 bytes
SHA-256: 2f4ab916452609ef08c68d249b64a18d6aa849b146a962ba13fa6a01c70b2475
font_02_sfnt_off000197b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B4 10992 bytes
SHA-256: 4f6fbd11e7430ca77661bc67cf4ca84d25c101640afe5179595ff39c9973e407

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