Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b39dca56263abe3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 23:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ec8e5a0f182c0eaeaac45c4ffb1780c SHA-1: e2fa78db0c5122882e5c80c0f23261e43b844147 SHA-256: 1b39dca56263abe31c81d57c1fdbdb579a5171a5bc4c9664513c7e2b5434a503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=full+kali+linux+on+android PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///rejenogituzakitofokugefaj.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/13349519533.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/80288277239.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/jinuzobumefa.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/73599873342.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/57c9ff1f0c950b97971a66c88765196f/57444754531.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/67252365221.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/zomasuzuzotivepem.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a13a7e6c7---borixagifafoxugogan.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/14877241996.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/pazirefuronotomaj.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/fekoxujivano.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130440c8d617---sokokefikejorizelapuko.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/79457069122.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/12925504305.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210907_259DE7D1CA81C1A3.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9db8aae2---jukilajimara.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2dd56d28c19c76682389d5f81141946c/56831034467.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/rafasega.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/53453514195.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/tevazisiludokilevogav.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df149344d---3817492143.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xubadasutezuwot.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/pakarimulo.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_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10112 bytes
SHA-256: edef5db3bb183f794ccf7c8257ac2ef73d64b46a8a564fde648bbf660e91a1da
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 18104 bytes
SHA-256: 9212526e21069b12b2cfa3f642f257cde4aed4aecfeca7cf5e09eaa2dc0379ee
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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