Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd9286aca45e046…

MALICIOUS

PDF

99.0 KB Created: 2021-09-18 03:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d557ed4863ece5cab1cf0468ecc359da SHA-1: 6a82e0e2c9ee8bbb07295f6258b42cbdf09568a3 SHA-256: bdd9286aca45e04698112adabd806734fc327271579ad6ffc68052545f17e2df
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports the classification as a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=hack+game+zg+survival PDF link annotation
    • http://cherryontop.pl/upload/fotki/file/mafawov.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/raxomitefuropataje.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/43f780feec317551d8321d1cd0eb3c75/jolimijogibujavuzijuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f52c4821b7---80064160534.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pimiserokijuzedazox.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/41207803761.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/74941734995.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/70411379813.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614356a1a361c---87604225249.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e642db4da1---98171878074.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453fc15ad7---lujaziz.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/31193097777.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/megesubegoma.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27785ed6a40d5b5a9709d7944028c412/tufibufinejemozixudiwavem.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/sudilalavixokufukeji.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583525a7f---41163566503.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10702428869.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/robuzubodelabazej.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/56673762683.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pagezirenu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddcd132ef---filefoxuja.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/simopifewewulepefirek.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/mulagetelenepizifolinatet.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/jarodime.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_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 19584 bytes
SHA-256: f6de811c39bcf616b3ad6c705e28a5edd13d366f5fe84d4dbd218c5593fdbba3
font_01_sfnt_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DA 10560 bytes
SHA-256: a26dd793a732a2ceb193e8a823125919e8690f2657d863708f316355399fa533

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