Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e92118b76ad1544…

MALICIOUS

PDF

66.9 KB Created: 2021-09-20 07:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 307079c1100b93b7444a9c1761e11faa SHA-1: f5b2150f8753ef999771567f9e3fbe681f5ffa5e SHA-256: 4e92118b76ad1544b309e21fb09e30d2861c7eb797abb0a0b7f350066e47a1d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based document designed to trick users into clicking a link, possibly for credential harvesting or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 66 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://crysiq.ru/uplcv?utm_term=portal+office+teams+login PDF link annotation
    • http://spy-military-labs.com/userfiles/file/15196067721.pdfIn PDF document text
    • https://mklaassen.nl/images/file/kijupire.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/14151378770.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/puxuxibowimotawigit.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/79823987133.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331dc6b329b---wefuvasalepigugupulew.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/maxijogedefarefuzodobidas.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/90117847993.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6d71706c---gakujajuwirikuzu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/suvukusevabuwizifirut.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/pewudo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130959511ec5---gemerusibidirepitogutir.pdfIn PDF document text
    • http://splogservice.ru/content/file/fodiladubuwig.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/muvujefakereposeko.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/67866645325.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/98055225056.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/likozutemuximo.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7951698482.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/71214713844.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/18694127381.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xurovosodafuneboku.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/gabiror.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_off0000ac59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC59 10680 bytes
SHA-256: de51efd17d74c50d9a6ab9e3382b062fc920e6b9d03f377d6ffc0cc09421416b
font_01_sfnt_off0000c4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D4 13756 bytes
SHA-256: 5f1e117d8f1be5eb94b0d2d279b1a653bf4a1862801426185534fcac0b5f33be
font_02_sfnt_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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