Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a5f5e94b27f378…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 16:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23fd6032c24dab96bf430ca6ae8d36a2 SHA-1: 1c6dae933200514875dd51e748f94d507e589762 SHA-256: d2a5f5e94b27f37882b536474a0db3fa4abf998de9bf6519f132d5ee4d1e0f07
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://onroerendgoedindex.nl/images/uploads/92798708002.pdf In PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vometufe.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/nofedirer.pdfIn PDF document text
    • http://esipro.be/userfiles/file/90202799845.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/771c40ae0fbfb81f297b263391f506ca/faduv.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/07f385c12d025bbc37067b765939bc04/71674050822.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138026ad68e2---xubobupakelon.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/xidamipatoderewasofo.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/xagosedosuse.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/60079312798.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/68829185259.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pukiwotimonugasunevuja.pdfIn PDF document text
    • http://www.siposferenc.hu/html/90739723788.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/3380357627.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f915683771---89838386214.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/puvedosawimajas.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bfc77d7281e4a0193d5183eb204ebeab/muvidotol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/09ba59fe8acbd4705e45dd23738a6dc9/zorofuvo.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/zuwikazeputuvotapibizej.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/fewufosesatoxoxonibavuni.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161333273e7ac7---69622699277.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/vupisogowogeledagazig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cara+login+bbm+enterprisePDF link annotation
    • 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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 10768 bytes
SHA-256: a5fe83b9ada43b5fa573075de063c748e4a290f7bd71ee961ab781f669484e8f
font_02_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 15660 bytes
SHA-256: aea23d2a5558de9c283e670cf182ffed815f3963e1505f433f810e0d378f1edf

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