Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8e3352f645eaa7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 16:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aef6245f8988eb9520e89829a00e35af SHA-1: e3dc9048f9ca3fa4ef728eb4c659d3bab3aa481d SHA-256: dc8e3352f645eaa7e7b38dd0a2441f8ac5d43473515a541f8708af8c4606a8e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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=how+to+make+a+live+lock+screen PDF link annotation
    • https://frisch.ro/files/file/93259206333.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/15386093002.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154ee6611d---galegux.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/kufabopoxe.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/batoxibariwubepe.pdfIn PDF document text
    • https://drlanda.hu/user/file/mugiwutijurub.pdfIn PDF document text
    • http://trevorhannant.com/26547536650.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/naxabotapagamonuzeko.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/67028912923.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kobuxalibegipibalu.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nogem.pdfIn PDF document text
    • http://vitrine-prof.com/files/41896640978.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd69998b8---42049903234.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/35907632420.pdfIn PDF document text
    • https://kapefashion.com/files/files/45080571190.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nojapatujewuvuwutimuden.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/keloboxoze.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vomawuwijofusexokatanulub.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/koxelegimitogawewolude.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/vivapejilodudafuw.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/woxupuxe.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f2920abd5545a42b2be7b72baa1ac05d/birudusewogugonixigugoto.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/jevupobanetuxasexigononoj.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/fulinuj.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909023730.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/konuwibiwad.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_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 17764 bytes
SHA-256: e8bee40a6f1faaae22ada61b3bc540414f5680cc86fb16aef6534608fae519cf
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10624 bytes
SHA-256: 43ff6647276aebd9c334a100dca50fe5913b99bfed3265c3426075b9cfa20937
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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