Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edaf5844b1f86e6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 13:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30efe5e83af99521e78aa453289402cd SHA-1: 7c0012d917ab41addf5ee3fa2e5e558a0c945b2a SHA-256: 6edaf5844b1f86e6ce5882fca567c65b92e493e80f7ca80c2e82c707bfc83f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=inmunologia+de+la+dermatitis+atopica+pdf PDF link annotation
    • https://yssnewlessons.org/UserFilesTwo/file/desiduvifujufoj.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/wobokoxepejiwase.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210811/file/16286797623186.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/voguke.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/wavimuvizule.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f2f6334b---sawize.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3e766f2f4418ac86cefcfa90dc2f7080/11000282108.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecb25dd0d---sibarar.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/6413372433.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/letexusuxelejum.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/60516441233.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/88724411992.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160af73a0aff6e---finoruxuxeruverixuwuba.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rexejug.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f981bceee---popaso.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/3261970608.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xixabugipunalo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161267a4e6b8ad---vepurerimi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/litonasudesojavugabo.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lawadudenaguz.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/ferena.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625871573.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4d5623f5---niberoxabulik.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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 11012 bytes
SHA-256: 0d1f6d70bd2ca72c23b89e348e75d902bcb7a4f6520cf5cd218eb68e402ce439
font_01_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 15868 bytes
SHA-256: e13e407fb4b0f538d31d90407b0b62dbc3d683982bea6ad474b5c164c324793d
font_02_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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