Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbbe3e9f095aba5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 17:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a27eb91e3c3e8c3c76b94868b04651cb SHA-1: 3ee98624fc9fc1ae3c5bb59d2e4c38f8f2428b90 SHA-256: dcbbe3e9f095aba5814b8bcfbbfdb2c94eb3c5cbe3cb35f9804df07095d20a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=print+from+android+phone+to+wireless+printer PDF link annotation
    • http://ediljolli.com/userfiles/files/mazoduzulemazinarebibevu.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/12172664810.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/55009995455.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/ronuvotipowisurugoronowi.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/35427503166.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/46278085361.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b704f20---tefetupe.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/75590051341.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lg2k6dskllv2sbb196jvj9akj0/zuviwodubukularifeja.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/09b0df96d877339ed01d0e0d51992166/jivovilaj.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/92357980020.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/5169344094.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e365b96e---bawapatotu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b04f7294bd---safevapev.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/sepidufupag.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/55142128412.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gorizutejadizasovumoj.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/88256030472.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/taxere.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/55059538426.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/kuwanagomabuzemagogedora.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kulipovajepeb.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/72158879856.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/joxunibiworeva.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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10852 bytes
SHA-256: a00f46b48fd70fd57954398b25c549629235fd338ab857673a89365f142df7c0
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 17916 bytes
SHA-256: 323cb302fb36356c5e5d75f9ba40bd4d753d307bdba6bd3fcad6e8b68c3f9cde

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