Malicious PDF — malware analysis report

Static analysis result for SHA-256 97133c5c24a95935…

MALICIOUS

PDF

82.4 KB Created: 2021-10-17 12:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df6877a4607388001c52f5cf8da42212 SHA-1: 2b0ebeecec9c24ac1a42d7b464a28e060d70751d SHA-256: 97133c5c24a959354cac57ca36e2a9609eed420fe0c253b032954ee3668d0459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=rrb+ntpc+question+paper+with+answer+pdf PDF link annotation
    • http://abogarestudio.com/userfiles/file/60248842811.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/watoket.pdfIn PDF document text
    • http://decorstore.eu/upload/file/81986480970.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16167e74a42d44---miwome.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c4afc73ae---34839139336.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/63276632664.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/raxelivuwo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be40c30ed4---34143193420.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/damavuworugew.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/bewor.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/47247429697.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/14190071309.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021920923355315.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/30698531251.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/66073800723.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/xodov.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/kiner.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/tomesomovubanako.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/tolilonanubiserusegenim.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/26324487935.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/mudojanumavelafis.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vivabuvagofotaxif.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nutiwiduxuvitojexiv.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f2271828881695d0d50dfef1c4470392/buzubelo.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 11188 bytes
SHA-256: 412ce13440b94bbf5ec25eec690e219f6104bd35de0012190a752930eb95b434
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 18132 bytes
SHA-256: fbe05f4d0d35bb04f94a5c6f15fad787f1c60f4f006a00ad98e6b874b733940a
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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