Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdfffb3f5b7f36d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 59784b6c5ad94e2a72b2d67ed7beb45e SHA-1: ae278d447c5b7cb8ca4c4ced1d7d31c473ab2e5a SHA-256: 5fdfffb3f5b7f36d8a30f65a2981f496f7a18b54d86ed58b46414ec5691ab97e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=how+to+defeat+papyrus+in+undertale PDF link annotation
    • http://buffagiuseppeinfissi.com/userfiles/files/tatuzajowitijojuje.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13ded416cba39d521083a894178da7f6/96749633869.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9078b3f9d---wunedepem.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f0f9f984c400fcc5bed066ad469292cf/sosalefizo.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/8d2974ce8fb859703daffec03e0270fc/jaxobiz.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/53220189875.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/redozekawubewef.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6d1d20c4---45218959234.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab109a1000---nafikugetuxadegiragojul.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/10345146357.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/vilenokubitonajeroxukege.pdfIn PDF document text
    • http://afslab.asia/upload/files/fadova.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/50789100060.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/at2j9c9gr6c73bcobcipgm9fl5/19129120951.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/kejebazamipulipexigo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/plfihh3t0e77d3fkfm2o0n7j3u/75918673686.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/72163750667582ebb2895bb29b01419a/87883930085.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/sinajukotulevi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/movomuw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff91a19753---xujirafuvifugumaf.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gedapuxujuvumakajuxaxik.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfdb18f04---nevimaroxifap.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/782lt2hngef9n7sqo7q26iai9o/kegojofokodi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1737d5766c---87813240592.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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10784 bytes
SHA-256: 3723545ba920681814d21a67e7106298950a524f183136531c0cd1e3786364a4
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 17132 bytes
SHA-256: c507da242bac68d09f8e8e2071f49a20716f31a8622539432f41eb1d492cc662

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