Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2ce766c28f1896…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 23:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe98d96ec267fbd58349218475b30e61 SHA-1: 2b7e434dddbad82ca2eb033b464607abe0ea1d7b SHA-256: ba2ce766c28f189638131b65b14a2650c07d09eff3397e3849cab9f6cdc623b3
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the final destination. Heuristics indicate a link farm on disposable hosting and links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ibps+po+exam+paper+with+solution+pdf PDF link annotation
    • http://web68s.com/upload/files/41602919310.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/36623439469.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871bb240452---75728097862.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc7f8adef---fiwiwuworowegajere.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3c5389a8d71a883000dc57a5cbff60b0/lamilaronidegusow.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/duxajogewokupir.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/6016058933.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/widororanajoxawekupebowum.pdfIn PDF document text
    • https://designclarf.it/file/furulabogutozo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/061ef7b7253556141ba788c083e7d20b/pazikagiseja.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fc9af67b0e1d099fd145d9652efcb7dd/33365332083.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/71d4158f3eaedd1d817291ac3fda1d64/galuxomimunitilotujabas.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3d1575f1f7bb162c9dae1d90352b0f6/52595129084.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/85095283228.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/jakawo.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/74862375546.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065571b74c---tenivamusuzajep.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/zigirasosubefileb.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/98067644164.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/woveraladofiwopofo.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_off0000b812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 11140 bytes
SHA-256: fb62a25e02e144d1d0c1ce17bf6827f9fa69a1202c63ee4e0f457833229a9a48
font_02_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16140 bytes
SHA-256: b8ecc39294919cdfa1d342aeeebf0ceabc24d3203f92419267c56f1f45558e98

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