Malicious PDF — malware analysis report

Static analysis result for SHA-256 142bf96f056c6823…

MALICIOUS

PDF

87.1 KB Created: 2021-07-13 21:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c275583796b7ed62643eb17a7e5c9330 SHA-1: 12ca9bbf6d5a05ac09f345f4556872a6df43354c SHA-256: 142bf96f056c68238e4228d96fcffa8f643f0650cd03b68f4b65e41fe939ccbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=when+do+puppies+move+in+the+womb PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rt7u9bc6o9scemka2q6frjg4fh/samudezir.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/runejibazopuwakijepubesi.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fegomusasokamosurifu.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0a97009d---ratukivoz.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5ufs40mka8610in941acmovk7e/xenutufumive.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/zisuvovowefabemifiw.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/47898250859.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/29376631848.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/bifaratoxabez.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8690e5f62d---83410563554.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3dc41b4b3.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/92d8d25b3f0943417d5b91f1d2ae686e/tumipefarasufab.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609306b1120d2---gizikedazan.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/98036699688.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2f763030---dokamuvilejogesobimaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b10f4f5a7---wuxurugaviporuseliwibo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871a3da3ce4---dudoluzafujizagabaroborix.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/g8icrubk90r10tslpjb559t0t0/mujokibakupit.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/978f916e84a82d27d71cb1c4e7829673/62709279844.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9bo5pnbh12fjd9ehqqqv010jnv/fimafim.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/49303029474.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d015acbff9f736a61c97c5feb25340f2/jufujadejup.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0060a15d---88825866526.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1b0d6e6d5dd9d83a451f2be03965d053/23314677007.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/75055618426.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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10732 bytes
SHA-256: 162f687eaa2bc31b47201ed9ecbde79f9b35d42c0ea3970ee6247b39f5fc40a2
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 16496 bytes
SHA-256: 83adcdc0fdf6d312c167beb7b07bdd6c7bb02fb199a59b6cfe5d9b72fb0321d0
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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