Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a3c8e333e93e9a…

MALICIOUS

PDF

76.7 KB Created: 2021-06-30 07:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2611129962863635379df4e8d4acb4f7 SHA-1: 37026e2f4422efc6d41b60cf9aee5f601cb11fd6 SHA-256: 97a3c8e333e93e9a139d0f994c6c77f62ffab042c3e51ea53b19b8b502673e4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination or host malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external resources, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://karpatskiles.ru/store/files/2587827888.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1cc5f1d5---35234749022.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac137668d14---bubuvusatubivexidi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8b85936b8f02b5a761d1bacb073784f8/joravegeluzidimomiri.pdfIn PDF document text
    • http://maihome.hu/admin1/file/sejijozusadefokaliruge.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mg3br11s0s4jiqkng8vrjguveb/68136226553.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d955ee07b---zizaxunidafibuxom.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b5530e49fd675ad8c33b15be8d0a2beb/44696431877.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/25316040930.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a21935d4b89---linesasamejuvesajiluf.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/641aa05a3a4af665d90c730daed254ea/nipixavaxotidisovugodas.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xojarova.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/84794428188.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/48de76b7fcbb74ed6bf835049e31285f/jututexapibiwodorovoxudef.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/dekovofisukewuzovixig.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bb6c5141---sisepidesotofoko.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/nuwavekezusij.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/64193559625.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/68200928813.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aaeabe3eb---bujefupubukiwilodavolugeb.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/76a71e82215effa3d8c34492fbd2849b/sosuxu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609273aba1d74---rivilabovimavik.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373b06d405---tujosabamepivudido.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f52f330b90f688bdcd68389f40138412/kilugalaxe.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8dmbctipgse5r1k7u71tq7db20/82477929330.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/58113360525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=verbals+exercises+with+answers+pdfPDF 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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 16376 bytes
SHA-256: e861742a18f2ec1105a8f8d754c3e3eefd510e36686710141d44f0433ae7791b
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10892 bytes
SHA-256: 8779d92074d92e13267b0fcb14490e46326c0668714c6e25b6e4cdb2b2d99ed0
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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