Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7d22dff6eb1555…

MALICIOUS

PDF

107.5 KB Created: 2021-06-30 00:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 512b01c5ca17df228c9fa78dc2b4a56f SHA-1: 8161b3e4f5afd74bde5fa95504aacfb529f9ec02 SHA-256: 0b7d22dff6eb15553912b83f903b72dca0ad2ab5b1798cdd2feb54a75b88b581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple external URIs and the compromised CMS upload links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=purpose+of+pour+plate+method PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607834c60fb08---71022313760.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/98734423897.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210629064846536.pdfIn PDF document text
    • https://coatielectronica.com/files/japijadojarib.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949d55c011---xomapitabak.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb18963f7---puwifozefi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49d366753---ziliwitigudadoki.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4cb21a21cd501bcecdb72e41d5d07529/66704130068.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c5f6813cada1667d814152fb126379d0/82894850773.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b692c5bd3b---75417334203.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608080d8cbe3b---jusuxinilakefebuzajifal.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rofofijageluga.pdfIn PDF document text
    • http://gistys.com/userfiles/file/guxiranemosavopamowaver.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/vemanad.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59126bd8d---63566414232.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee00ee140---bakirekaxotutevix.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/39050417108.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bf95e1c---51082032873.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8766df707b2f2db73ff88fc5557729eb/salelarawiwurukum.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/jegimikifisedilila.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/300a9cd90c850b6bbdd432773d67f70f/15929291098.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kukfdamo94a4tld7uhfplvbs90/24892809867.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/18a07381aced893f1690030cefa761fa/rivuj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/29016c0662f7b2d08c9b36e43cbbf1ea/vefiluvavitunezimumofuz.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_off00014051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15868 10668 bytes
SHA-256: 1fd99a21f787eea79481bd1053a04ad533e62848f846ac445a104cfe9b5760e1
font_02_sfnt_off000170e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E2 18176 bytes
SHA-256: 4642a32163e2f724318e2ebb1c6a2e00eaddb6a7dee4cc1ab9b1ede6f6a987d9

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