Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb28b514f3e3154…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 05:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da8379ce9e37ec58d60ae306fb08b944 SHA-1: 9f2c63afb533bb122b1f8f28b274bee3efcbc9f5 SHA-256: 2cb28b514f3e31544a1fd321f75e31475a5726dc63859c6e54ed577c56baf2db
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to domains that are either compromised or disposable. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users through a variety of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pixomot.ru/uplcv?utm_term=generalidades+de+la+administracion+hospitalaria+pdf PDF link annotation
    • http://greaterdeliveranceministries1.com/clients/61527/File/xurarobosipiwa.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/26262986879.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf6203cb98---38172357053.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210608015421.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/16088259083.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10646af1b---53341679658.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/92875835802.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/gomufuzane.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/womok.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428356d477---ritezupemo.pdfIn PDF document text
    • http://sciattella.net/images/file/39289116282.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/9045111778.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/60142724451.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d75b3eb12---68220243623.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f36dd8484---laguzirotosuzuxanamuga.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3765669c3532369fce538cd2e72bc9b9/9184662637.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4a5be286---neketelezegekuz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8b04f0217c53388cf914028ead6c746c/wutamumolonivapig.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/40808769259.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f4563c6ae64436f0087edb54ea68dcee/wonaxuvasox.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/59350217951.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/23e27f18d85092b257beb7207b3148fe/92369936868.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vijarax.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d71884cbd---vapizarofagikinib.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e04ab8e447a---rasevojejosixawupirefib.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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 19644 bytes
SHA-256: 0b3e771180ac65aeaead5aa08f216fada8c16529dcad0b81053460d52c8a3388
font_01_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 10924 bytes
SHA-256: ab86bd094f9688eee9ea50ba8f387588203e4b25c3455e33d4a33fe1ad00e53f

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