Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6f85bd3d9085ac…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 15:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79d10877f0bc04f485eceaa82095cf6e SHA-1: fb26f92998ffd140cdb745957f88942e2b89f8fe SHA-256: 1c6f85bd3d9085ac65cb7964fe412fe0517d0dc75e0e9e11a0982de8bf5decab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several pointing to compromised CMS uploads or disposable hosting. Embedded JavaScript is also present, suggesting potential for further malicious actions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pixomot.ru/uplcv?utm_term=holy+spirit+parish+north+ryde PDF link annotation
    • http://eshop-kocicinadeje.cz/files/file/rapapupuvazolisin.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/16590849822.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_053812.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/41908069285.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/podirugavuduvew.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/gazemos.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/019978ee028ee56972a7beee5362f747/jubipoma.pdfIn PDF document text
    • http://unibox.lv/files/text/mujagepen.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/79750200048.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/zajere.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090301473673499.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/54294017160.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/69817766942.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613278920950b---dazejana.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906184915_1830385616.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/40971287618.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/14344322029.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144390b7d7a7---51190782610.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/natevoraxobazegutofube.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/ladilaxepedaviwak.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161313477c9f70---20997916244.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_off0000c2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10596 bytes
SHA-256: c4b6d6cc7d03e47ca8da7dacd8ad1ca782bc2fa2761066c1f589e51c7aa85fd7
font_02_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17944 bytes
SHA-256: 4cb8213c0b0d2841201fb25a9cf5db74a756f67ec9001d9b37af6a369de8a1e8