Malicious PDF — malware analysis report

Static analysis result for SHA-256 424fd38a2957bde8…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 22:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d27e2d0b516ccfcde38dc1d43698e96e SHA-1: c2c7074516b1ba44dd424824d640373244c6b225 SHA-256: 424fd38a2957bde89399da5f7d92e5e634e6274bd8fa9b8d1651c80ce315f6cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for obfuscating malicious redirects or initiating further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cintabogor.com/Uploads/userfiles/files/tesaxowemaneru.pdf In PDF document text
    • http://pro-customer.de/userfiles/file/tegofitivuponefobe.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xifolejufejuwuwozitoj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160865ea1e7c49---sulivaragutebefuruniz.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/vaxal.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/pefexatebasuvifuf.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/kejawajovexafikubizibap.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/97407826657.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a99effe5b05---tonimobujebebadefeg.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090a780647e4---93067446636.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/29792215535.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/83199739333.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/39874555931.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/382df620f12fa282fb30725f68a81bdb/84976408990.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/3932193090.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b497be429c---67316738387.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/87660467527.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/vilosozedubakumaravise.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54992938411.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/33329038485.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0959fc14---14660237621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=subject+and+object+pronouns+free+printable+worksheetsPDF 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 14572 bytes
SHA-256: 405fe1cb786f3e460b11218b66e9fe6b197ef7c914b4fa2c2eb7d49437f2ea05
font_02_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 11340 bytes
SHA-256: c4e2f2223d8a9bcf3923f1dc6b937a2d9def290ac923e12305865531e6248d68

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