Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d212cbc6de7aa7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dd9ca316649beca65158d6e2ea00753 SHA-1: 04b06d996de01875c71ebc4eb72cf4fd0e9c3ea1 SHA-256: f4d212cbc6de7aa758d310749954351e9caeef11852e348cbbe851657d563b6a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, but the presence of multiple URLs, some pointing to compromised CMS uploads, suggests an attempt to redirect the user to malicious content or downloads. No scripts were extracted, but the overall pattern points to a social engineering attack designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://orgue-chantepie.info/FCKeditor/upload/file/81677978327.pdf In PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/duviginedalepeterurufaz.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/tadedopazomibujit.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/betuwuxejolologozeluf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613927ddbdd7f---pejimikokapar.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec6a6021b---79402269163.pdfIn PDF document text
    • http://kftchem.com/upload/files/tumutumupejemosegekamani.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/faporixiloxol.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905175835.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/rutij.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kapoxunopusoxafirikew.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/siwuvusep.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/81480126257.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17616532761.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/83975700645.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/32340326620.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/xasagakapezalak.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/lopiwaxuz.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/41925768892.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/91617178089.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161329068973bd---zosaxepapelenuva.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/40082370313.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/42353250288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=boxing+fight+online+stream+freePDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10816 bytes
SHA-256: a91f7e9e18f23b617647f92529cbe3070559338be6809d06c070b6d4df05e62a
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 17840 bytes
SHA-256: 9540d165ecfbdeeadc2b16366b6e584b335458cef90f47fad0b393a6f370b09d
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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