Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17a6cf26dc05379…

MALICIOUS

PDF

94.4 KB Created: 2021-07-01 22:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2a129d642350f4fbe9d6c8fdf814743 SHA-1: 5610d667bb8fc3db41caf320b6da9f293482c6a3 SHA-256: d17a6cf26dc053798d03179ff1ae138cfb8970ce211e40220a2cfb7db57baabb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning model. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=high+hamstring+tendonitis+exercises PDF link annotation
    • http://gerocuki.hu/user/file/13565490398.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/416400bc399f525f622142f97e2c23ab/tuxudadu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zakopurusalonobopiza.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073d71c18dc3---98460314101.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/97952090869.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d8a905e2881c04f08427e99983349136/tutun.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fafc643d---37896737471.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zepubatobotafe.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/lsmrpr3t35vb32so5aua9eqmp5/fasewike.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/terub.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0138409493---pezeropot.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/bb351ffac369d26f13c52551d1416f75/gibabazezizikovivorov.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/fomep.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b92999b545048c69b7d99221a657d1c4/42467264094.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wasaxijegenokabewizujazum.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160737f2e6fe2c---91630962990.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/56681222330.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/69bd259b7cb3c23c647bdfb0b3eebb21/57063306260.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bded29262b---zilafamonapewuzus.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80db98d79a32a379953ec919acd21b38/19673986357.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/e71ugjdc61bikap9665qo88gb1/13216301030.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160974662df8a8---biferitegusexelowinuj.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f6f0f545736abe2993002999f12e7f3b/73445665718.pdfIn PDF document text
    • https://actor-conseil.com/files/file/doziga.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/65109920853.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kugusatuworowudadanowewab.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc8987d2b---33557910612.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc6b90e26---30017120506.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_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 17064 bytes
SHA-256: 5b1fdb532f74dfb7793eec8603d52db6cde899db647875807eec2cbb39775c1a
font_01_sfnt_off00013b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 10864 bytes
SHA-256: 97099ecf71f94d1e64a7b4fbb82902db64c9282c21aa30f4bd8df47ee4dab90b
font_02_sfnt_off000153c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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