Malicious PDF — malware analysis report

Static analysis result for SHA-256 5757c3b25f799c31…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 15:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf7bc10dd654b3583e203aacfcb395ed SHA-1: 5ede4f7e63ee0fc83f22d68f589017f7c10e637d SHA-256: 5757c3b25f799c310bbd422b602b08956af52bc5228c0e8f0806b312ddf88f94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=food+for+all+std+5+questions+and+answers PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/93863666963.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/71825333223.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/63276725428.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161536321d0cda---tobut.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wimitubira.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452efe878f8---67523620637.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/rukolizibaresi.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/46117846686.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dopisirinomigudigawesogak.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/27588696653.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/68125957017.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/52513330924.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/ludajizolenogo.pdfIn PDF document text
    • https://cmf8.ir/data/file/wiwodewumopexogir.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/45440216212.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c953ab77---68231021691.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e684609ce6---babiriwumonubamutuzo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/foniwusen.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/2080897221613b9148b851b.pdfIn PDF document text
    • http://balalajka.nu/media/koniborugajutifuroz.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/jibaka.pdfIn PDF document text
    • 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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 10792 bytes
SHA-256: c6f15df570a9b6681952a367fd9256f13c92950420873562364739a7f085b73f
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16336 bytes
SHA-256: c627ffbb2810d5d5ab93ecddf672b376e237bad9487718ab19d83a3e321bb2e0
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1