Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8821af393561ce…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 23:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e16c43e6b563272f65362e18f69f83b6 SHA-1: 84442cf91f132173ed42411b0cfa76a3eab950d3 SHA-256: 7c8821af393561ce1cb7c64e62d37db291ae0890eaf0700f4b1a5e87ed0e460b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=como+fuego+en+el+hielo+pdf PDF link annotation
    • https://linhquan-group.com/upload/ck/files/37090603469.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jijujus.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/loxek.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bavejur.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/26027460446.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7699917f4---30986465324.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/filelivekevinibuj.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614226bc22c15---libatiwususoxuloruminamot.pdfIn PDF document text
    • http://baoveantam.org/upload/files/92953206111.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/suzumod.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/58130087446.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f917c3ef2---2861434664.pdfIn PDF document text
    • https://webmenuplus.com/images/file/5155447391.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/365504_pafopukimid.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/95240973706.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/ketuwisimumizidutenevejis.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/90569489373.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/wirasemevojogafavelu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/48611960965.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lunimupetenuxipelev.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/majimezafojawebibad.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zirosobovoxirudibedivu.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/mufijowepukuwadebirukut.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wuzoritewazanabiwozozaw.pdfIn PDF document text
    • http://scro.ru/pic/file/nazodam.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 19192 bytes
SHA-256: 858e27ceaeefcffcfb553cdd47ab3fef6a128fa1d27e998697be6d2b03539248
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 10548 bytes
SHA-256: c3775451a414a27d1776ff302d15da4dab76365d1eec5f80ee8d97c32f3e5ace

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