Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b6b9487c4eb685…

MALICIOUS

PDF

93.2 KB Created: 2021-07-20 23:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be277481774807f1920a0a1b4b86ecbf SHA-1: 3041cc05905c023e328224de8c0c9f134f12629a SHA-256: 55b6b9487c4eb68516101248e5421ce991340c8d2d69e7ae7b0da1418735e47d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and compromised CMS platforms suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e62547724---peletipumuwi.pdf In PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083246a5e952---tosote.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kejepimowi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5844caa319ee0a8ac6f63660e98755c9/43563177407.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7fe51d8d02acb4bff47480627191b71d/bosusuzalibiwujotofopeva.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/33189287630.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fd5b9af946a17997409728198b705897/lomewuvemawubuzosuve.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b096087eeed---levixojedadutexuwur.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/000c4389dc55ed0117079d78bcaa83ed/forulimobulaxagotomerugor.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/93577696978.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6325570b49e8ae17e13aecb5322f9eee/83576245132.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/98488722900.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/91593859103.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0b2194cf---muzurukim.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gogatajojipakosesum.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607092cf30dba---14079117638.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714051554214.pdfIn PDF document text
    • http://fructusartis.com/i/File/fivipeji.pdfIn PDF document text
    • http://redactron.com/userfiles/file/fuvegugapi.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/waditepo.pdfIn PDF document text
    • http://groupkaishan.com/d/files/61156031257.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/67031585923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hyphen+after+mostPDF 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_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 17352 bytes
SHA-256: e4925471fbbf635148dd028007fc5e964167edd3e70dd7405e7da149ee8cda85
font_01_sfnt_off000137b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 10588 bytes
SHA-256: 26a1784590060e8f3d0f7a5b62dc1c53fb992c5b55f3e2fa5d0dfe1ce7b283bd
font_02_sfnt_off00014fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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