Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb34d52d62175db…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae6733e9fcc2a8a5af4c2f55569a3fef SHA-1: 3c38de5917584d862485a1aa3e6178dcb4c652be SHA-256: bdb34d52d62175db27080cc96aa842f7ad1067a05cd06f30825c5f6e099f8dd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The file also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=hunger+by+knut+hamsun+pdf PDF link annotation
    • https://gretajensen.com/ckfinder/userfiles/files/28111287475.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/5997315513.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/fumofuzexo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390916d9cf7---wavugu.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210913100114.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/15463817378.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/62686283254.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ogddmc9eb4kq9ai7n58ejktcvi/32052490555.pdfIn PDF document text
    • http://newo.ru/files/files/dakowaputesekukujusojog.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d1ebd1c---fusejadapinami.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/geninuzewejiwavobafim.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/64587663294.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d403b94b6df227b67ae8c7d359509213/26370746537.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/lolowogirezalevi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/70je90p3n2hk5eru0t50vbe5nj/98876940091.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/32611201781.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/kegopofuzanijijab.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-04-07-22-02-43.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109220245552276.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109080632161844.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210918053346_1938108072.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/c7iuhe8nnnqieee02ur9q4kg82/1106610088.pdfIn PDF document text
    • http://odumakus.com/uploads/files/porigunivutaveremed.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/soterukepajijor.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/14133174829.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/zitibamutosutunakegodib.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 18344 bytes
SHA-256: 1f83446a465a8393126723258feb76d96c5a3d6900caecacb07cc64af92f2aad
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 11124 bytes
SHA-256: ca233969b5e1beeb7a678ec24ece617652e0b98d95cba210e129a749b85c8c67
font_02_sfnt_off00012aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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