Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fda798d6da6171c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7b3f0896aeb62de4a30fd7c2f26ea6f SHA-1: 76fc263936ec5afba71c2c67e67f74ac66498494 SHA-256: 1fda798d6da6171c17c967e26de3b0d13c562006276018ec66f4c0cc179a3aca
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the presence of numerous links to potentially compromised websites and disposable hosting suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://ghalemdi.com/userfiles/file/5523600985.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/da848249ede7079855f1206359e774f5/9639637767.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/47315574336.pdfIn PDF document text
    • https://emprenderem.cl/files/59631155901.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846df406f54---febaxad.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaa0e69dcd---39679359933.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/kifetejogadoderin.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e959941141---kasulawivuzanojuperaxaw.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/texugaxog.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/12639096962.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d723b20f139---71555951076.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/33308537765.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/filor.pdfIn PDF document text
    • http://e-hematologica.com/users//file/naxesovakufilu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106fab976a91---40923908150.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xukukuwuzenu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/94229194021.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/8041851945.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/65831554239.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e1870219534---dawetepo.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/xupujaji.pdfIn PDF document text
    • https://masihpt1.com/contents//files/molukozereluvetetibewol.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/zusokorogowas.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/95900438288.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/43350649989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=medical+terminology+exams+pdfPDF 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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 18276 bytes
SHA-256: 87a2d6f83b6694593612983115b30cd226bd15a801dfb852fe7661964ce83b60
font_01_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 11172 bytes
SHA-256: 5613f04b14122eb39fa1be8bb3fc9f470a9091fc92d94586a53bac3cd7466bbb
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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