Malicious PDF — malware analysis report

Static analysis result for SHA-256 85815a1470cae9a9…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65c610f04e36433a3c3692bc6871099b SHA-1: c22611ecd406a26c9baaf0a24c00837d0374ce4b SHA-256: 85815a1470cae9a9de7277302de110052f46fda69202bcb9fb33ceb7d0d37156
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of compromised hosting and a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bloc-immo.com/images/73813236880.pdf In PDF document text
    • https://gornjastubica.hr/files/zuburizejexakupazuwe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdb85048c---jivole.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/18228566731.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/1843241614.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/misopifu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/wixegepekonupovu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-24/20210924190404922286.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/pawanezerodifezexened.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/69851981186.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/korajikobavesiwawovedazoz.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210915200109.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/tufawifo.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/visepofejewujetarej.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/jatebisivumagefabegon.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rowakivuwenataz.pdfIn PDF document text
    • http://lachina.cn/upload/file/xujuporogepegusubu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab333cfd8---51139824351.pdfIn PDF document text
    • http://rnralpha.cz/res/file/40487182462.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/juwugobuzopajudekabam.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nexagajetudok.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150d14706453---remibomobujatetojifido.pdfIn PDF document text
    • http://dytac.hk/userfiles/limojokinusoxelegu.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/98332888575.pdfIn PDF document text
    • https://tavio.ru/files/file/16487011462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+website+to+download+korean+movies+with+english+subtitlesPDF 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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 15812 bytes
SHA-256: 50fa4dd7e16bd3af8ffa7811ca1b58b09711efec3aef467bcb84975e3b0cf380
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 11232 bytes
SHA-256: 2a1e84dabfb7f69ac8e11fd99f8a6726feed31d7a2e8f5132af55a9648dafd1a
font_02_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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