Malicious PDF — malware analysis report

Static analysis result for SHA-256 10412a2c65d25c2a…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 06:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6caeea58e124d78a39105e160d989742 SHA-1: 62470773314378b1b9a52e6816adfc1fd7c6e305 SHA-256: 10412a2c65d25c2ac7b0c47dfc7c719bebab2a8657a25a2e80b1c2f961b62fda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=shake+it+out+whisk+song PDF link annotation
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/28d1cdd8a45b0e295c997e386f6a9f26/fedawi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087272a27490---bomamixisebabe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4185a94c3c---setugekaluvamezewopatep.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/51490031906.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc0fe3a24---buwawagezuwelawazuwulode.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/losemawigutajisu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcdd038ca---xusumedugogujigufiva.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/sowume.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812b674da1e---399915553.pdfIn PDF document text
    • https://kaimano.it/file/faxugazuwozinepibiwotiz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee2f58c78---69473267219.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/78854284898.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/95534881450.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/miwezojaxekovawutapusuru.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/xakadarumuxasus.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/57712456094.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/xidabukupumujom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jilixaraw.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pexuduponeniba.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zefoganalisuxekarada.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d7c1ab4060cab8af83a382af65703b7c/9209084273.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/kukunumisotinemebukule.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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 10592 bytes
SHA-256: 92a7b26f171336287af18a39abeb39b3a534f1af6014ebbd7c84e5286435841a
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 17244 bytes
SHA-256: ca3cf065853036d50a8b9a900dae2b858aead4dcc37ada92034292db28fda769
font_02_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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