Malicious PDF — malware analysis report

Static analysis result for SHA-256 758ff6c2331c2e01…

MALICIOUS

PDF

68.5 KB Created: 2021-09-14 18:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51b51ba0b40a23938c35843b7eb57221 SHA-1: a588a87f62ad21b69a7042625741fb8ecc6cc37e SHA-256: 758ff6c2331c2e01ee77c6a00c9487341a7716f6e43e631c2c8f31c2a16578e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates it's an image-only document designed to trick users into clicking an embedded action trigger. Numerous URLs are present, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm intended to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=calculator+photo+video+lock+app+download PDF link annotation
    • http://01host.ru/userfiles/files/29903740767.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe214bcf28---92162848854.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vovin.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/45697154902.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/ganisadosagagebi.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/gewisifagarinatoz.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/97649506048.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zaditadoxaranomaw.pdfIn PDF document text
    • http://www.grifin.sk/files/87727838841.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e05f4017e9788432a8fd53990203c4bc/84086849511.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/lotanegu.pdfIn PDF document text
    • https://vitanov.rs/files/golijalararag.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/fewuzo.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210905_37B6C2A09F48DEA2.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/50312573124.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/fetedesipusu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/jovipaba.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/59433601292.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/natemir.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/25446116562.pdfIn PDF document text
    • http://innotack.com/userfiles/file/jopotuli.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/wumepanozobufiwemaredawa.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/74710864338.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/58182431160.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rerijofikupiwuwasiw.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ebac1c42---denezajuzegujasiv.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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 10816 bytes
SHA-256: 667e9b28f2fb2419ff5d635908d7676b5b65ba8bf192b54f2bf7dfc03cadc957
font_01_sfnt_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 13640 bytes
SHA-256: 7d1c77b749cec41fc97b616fdc9093f0ea4e851cdb7ce0d659dd748eeb3abe6f
font_02_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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