Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8ffa7ac0b97401…

MALICIOUS

PDF

88.8 KB Created: 2021-10-06 05:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e0d9ad156ea5fd68ca51191ac59462e SHA-1: f3c9aa6673c90eae84a588403c36ffaabb67113f SHA-256: 6c8ffa7ac0b97401af583f16c42b8b0266256bebdc1af398b26f95a7a4b2dde4
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 CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://studioferrato.it/userfiles/files/tofezalada.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/7478391476147f510cec62.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/29232954203.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/mujulozizumeredaro.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/jezamusarumebutofud.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/43772476746.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/gogaferajevutagajopoda.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/dafowafolaloxo.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/64190940882.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/mipiwunu.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/3719631034.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/givorawom.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/jamuvodifizaki.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3ab75a6acf8b9f59ef329a20bc1d5e09/degifapopuxuxifamem.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/88868238053.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/46082460023.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/foziriwa.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/5164890437.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/dojizisevotilibaguwatu.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/179eea78912d3a61e4923d8044aeff55.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/pusanesibate.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013a57c298---mejujefosuxa.pdfIn PDF document text
    • https://phukienbep.net/media/files/xasukovesogobijudaki.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/lutoguporukiridulena.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cae1f9cd91---depidamuwuzabufugusalupep.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/23300727031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=worms+that+look+like+hair+in+humansPDF 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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10560 bytes
SHA-256: 50aecfef2b08156abbd640b090f836672f29ce8ff8f3aec7798b294baae1fe2c
font_02_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 19472 bytes
SHA-256: 751503b9d597c63534a6f91f9cf8963f0c1b559c514568e7d4bc5f9011f9a154

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