Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2849a61cb5577e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 21:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35eebb021a5a7bc821901076846def12 SHA-1: 3cfb1254dc542b3b8fc73f652d9d20ec752af6de SHA-256: 5c2849a61cb5577e3a9e75255758c7291699f303184e717ddfa4dedf2c99bd50
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised content management systems. The primary function seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=naya+play+store+download PDF link annotation
    • http://ropesadventure.com/d/files/jeloguxuvasubedapesav.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/68074281414.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/71711691489.pdfIn PDF document text
    • https://wecareprogram.org/images/file/nupirifineb.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/nevefisaguvo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/747037e051a27567be6fdbacb91af74c/86008585204.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/tojuxibitafenosaninesi.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/89588338792.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/pisopudafapoborodewutile.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ef9f2b9611a3193a59315622d9346143/27961831876.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/22240606199.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1f89ff41---15758469162.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_072343_100.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/misuvejakomeritop.pdfIn PDF document text
    • http://chinalabware.net/d/files/vowelusituxunulimejenukud.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/fovexuvibisewef.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jazifotoxebojakesu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/13441879901.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/74316146416.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385a5486e6d---surepoji.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/40972833860.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kawakoxoleniwirax.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/99920476016.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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 16448 bytes
SHA-256: 4b530d1e7536b948dddf76cac7e660a4da8ff55195a2325612bbbbb0e2e09e1b
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 10468 bytes
SHA-256: b46b57c11fc1cb9c43664e121b811f2525fca0c045a1babcef9cb8398715373c

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