Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd3fdd50ef36d1a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f6b4f4d834c0050605354447523fc88 SHA-1: b2e74675d5eccd04b2e5d8daea52ca81305a77bf SHA-256: 0bd3fdd50ef36d1a43c24c1929bd8f59d7df12f4900ece65d5ea3442ef45ea81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous unknown URLs, suggesting an attempt to redirect users to phishing or malware-hosting sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jar-ted.pl/file/kamujevejowonudinat.pdf In PDF document text
    • http://garageanything.com/js/upload/files/winovatazodifotubuzataki.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/72304519388.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/91499358666.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xewimiguramesolagije.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/39851506736.pdfIn PDF document text
    • http://cloverdiamond.com/file/55498756838.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30713813037.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/puvawoxidakazulegenuwa.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/15183259185.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fb1b5a0e---56242901322.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312130269539.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lazasisoxini.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/5521202549.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/vuxadusakawubinub.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vegofimusisaxes.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/pikezaniwapabokevu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244df4735a---22033283170.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/lawapus.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nosakeladasiloninipala.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mej2d6nodfnfnk8u6edoetkh76/pitawimuvanuleb.pdfIn PDF document text
    • http://peoplefoster.com/pliki/mopogesulopupov.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/dadoravowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hard+reset+samsung+galaxy+ace+3PDF 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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 17364 bytes
SHA-256: c719f1150a49dc21b8c50b4e91effe21f3b3dd331c843fbcd34a6a0e58d65346
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10980 bytes
SHA-256: b554e49a2611f1e3be0740b107611f1c5bdef7066718f312bde3a40775040c66
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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