Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c8adab2cda2687…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 09:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3a0b8759e02d579272e80dc040ae5e6 SHA-1: 0b6daea46201b2b82bb79380e4157374aac7d08c SHA-256: c1c8adab2cda2687691250dcfaa6689100826441bd9812cac20cd3bb894c0fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The embedded URLs, such as http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dd5e4bed---wogevevuruxu.pdf, are likely used to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ehomerealestate.org/images/file/gugasug.pdf In PDF document text
    • http://verypool.cn/images/upload/File/74331785955.pdfIn PDF document text
    • http://apismorava.eu/docs/vuwixiwugugupadilibuwa.pdfIn PDF document text
    • http://gaudi.tw/upload/files/poxawizewugaziroxasarutuj.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wituge.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/zagepudojos.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/441e9723d83610c1c421ade02a03ecbe/zatumovikukatoj.pdfIn PDF document text
    • https://hotelcorona.ro/files/46590004450.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/kebunefedup.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5225dd931---15212630546.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/46438722279.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zamuzatolet.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/27669225746.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/63858058066.pdfIn PDF document text
    • http://www.bash.cl/media/file/26675135583.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/45476428852.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/81482737229.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/7589116504.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dd5e4bed---wogevevuruxu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/30731268150.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/36656373119.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/minuf.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/nirugawosimotek.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161411651e3dd0---62951816679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=note+20+ultra+hd+wallpaperPDF 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_off0000be03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE03 10532 bytes
SHA-256: 74b2b12b6fc3d1861875884b65d81ef176c02eef47ec1db3a4fb50774281222d
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16188 bytes
SHA-256: f4b97f888ad55365a368dbbe2b08042dbbcdab13504e860905bd324d00891c1e