Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b8c943b700a91d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 02:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 501bdfee6b6a4859804bdff9c6e70bcb SHA-1: 721ca0d22a2f9df55d9a2f9ff2e56fa5236e48d0 SHA-256: 14b8c943b700a91dfd099c707dbca3758a1bef08fbcc0e6dafd99fc7b6e97408
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sziazsauto.com/uploads/files/48914529757.pdf In PDF document text
    • http://allineers.morefriendship.com/upload/files/jutimetilumibuwalesi.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/7937979281.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/xekobomeretarosuvovorozev.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/2191472662.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/zibufidewinofabore.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/mujugefafanozabubekuxe.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/eee38748d08f53c9c58cd7677c332df7/14051925268.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161312ed87d433---36348157642.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jividunumoxaxew.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/kowekuvoma.pdfIn PDF document text
    • http://svx.su/ffile/file/tibitazajewub.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140938a72973---11434144707.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/5106176652.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/25831541355.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/57018494536.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/61398492840.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/kenowugezonoxadegujeruxi.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/95479514823.pdfIn PDF document text
    • http://capital96.com/userfiles/file/badezabuvalesad.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/dozubezewit.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/tivepepukijizitipavo.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/92904990512.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/79616268806.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/243b48f9d71aeaa2086b5546c81c3205/72814035230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dark+angels+codex+supplement+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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 11168 bytes
SHA-256: c0831a10695563f96f8c5f325febab98bd68edd3ee4b6a0b00a3028bda947231
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 18000 bytes
SHA-256: a0538aba193e0ed21b1c7c149019d75a8c5d868c36d9804d5d0f8a45e5355a24
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1