Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df3d3e789181c19…

MALICIOUS

PDF

77.5 KB Created: 2021-06-26 18:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eb1fcc406ef1d0e0bd9cb4ca772c62b SHA-1: 051e7f12495e1a0d8daf002217e4ddee914bebd4 SHA-256: 6df3d3e789181c19860039b108b43359a5bbde9a5873544e433b3d737ef9916b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The structure suggests a link farm designed to lure users to potentially malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=videos+playlists+video+download+free+mp3 PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e009b97fa---geretifoje.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c921e48---vapawovijabu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e9641f701271fa5504ff26c9e19307ab/gitugewavozivemi.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210609031407.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab3919c16d3c9faacb458746451198fc/vifefujalaradasavepozozak.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/onoavi285d6mp6nvt3dfrnrf80/kubeziwijupimilog.pdfIn PDF document text
    • http://salkim.com/userfiles/file/saxikabezemugemeniwami.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0f794302---foguviwozexon.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/115033f2a44682a979083b9c47659381/bisirojare.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e6r1peag8c6lsa269go6ju3rbm/rawomofevusaxifutavuk.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0422d30d4---kabobugadaxif.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9sb9anlircps91ledklb6eaft5/mesodutigavod.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd8cd0e91---binazewi.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/12109380775.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/vixakulovigezelara.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/43188099662.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/tcm9efuc6bk9pe0cb66i662cto/85284936495.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jururakikelaxamufe.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mps8nltmdvli0a4l8f0c0kvrj1/95604165633.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9d357927---lirukojamo.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ced90b839548509504e5e650f30e1404.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/182ba863170916fa80fbf978f6569fe1/sogijanefowasinud.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070423411dc7---33509157489.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/975a766f4dd0300e9ffabb3ecbf65e92/tetekidupavijuki.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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 16448 bytes
SHA-256: 77f075155d65f2c6861f799cb6c8ede0a422231c6671d08645d2fa1c3078c032
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 11068 bytes
SHA-256: 780f9114029f1d0073b50f578f0f816251092014b13915efa10e189ca7d56fba
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1