Malicious PDF — malware analysis report

Static analysis result for SHA-256 161cf3a5a7218aaa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 08:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0bdd45d2316ede4ba99fcb17f517c20 SHA-1: d73011dc8f3109e34b07da96c99ea5bdf1a4ac2c SHA-256: 161cf3a5a7218aaa21fc74cb7af295d7fb0649f90af7fb23c2faa1de27e4b20c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://botosani.ro/img/uploads/file/26055098443.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3pu45v2hnphns6emk7vma81jqp/66220613557.pdfIn PDF document text
    • http://signauction.net/userfiles/file/38992972480.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ecde245ac7ea952ded716f4da4b21571/moloxabudinemikako.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a1e2a3ab03d4394268501cdb16cb3254/62358749694.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/38324480888.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/69261279206.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc3d8a1d---diwomomupijiroduwikukom.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/doritiba.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/29407708715.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/tuxamugutenotuxuxijir.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5d1556ff---756474082.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/bfc5e375ac4439d6070a3ce27d8e8103/45452872450.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/16778045898.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/26141470133.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071960620915---kudikijorera.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607132422eede---ritiwunujolusod.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608749d186890---jisupaxek.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/dodizetarigala.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pelozemujuxab.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/limalag.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee821303b---99536066510.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a93fcfc746473d57c75f7060cf951c1d/xopotajikovew.pdfIn PDF document text
    • http://flexicourse.cz/res/file/77118042067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=music+ppt+template+freePDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10508 bytes
SHA-256: 6f4b57c405d95450143b78f90deefb78b43b893936f999f6cb59a1075a617a74
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 17744 bytes
SHA-256: 54dab571ebfb0a7347c9be1570c757724f0ddc646c6f47dea3e9d51975bf5f84
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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