Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e61339633c1219a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 16:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bde80803184cd41f1cb64fc9c24957ad SHA-1: d7cc239169b3580e2a60f6b7541c6c7e217cbdae SHA-256: 8e61339633c1219a107dae1ab5e13e0c617ae9d6e09d404c5816d7cabe7f8fac
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a905d8a3a99a87f1b33b227064c10494/lokusomuletogi.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/falagorupatekerizilogowa.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/417b879c23625dbab9a3fbd16c6b1e16/279331697.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/40011191008.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/9593296378.pdfIn PDF document text
    • https://ocw.tw/uploads/files/16857626460.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100044509e6f---jozuliwut.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nemozefaxebiporaxusan.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/20992043485.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/71541330957.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/kotutoxefogatipop.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d627dc44af29fa3530958ce26250d1e7/61984626806.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f064ae0974---29479191829.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/db45f9bacdaac053e7dfa4462e18fb1e/93118725983.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607498b120f39---zizineviwojav.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/64778174883.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4b3cf650d36c8dd0cae8ea6701f5c555/84512646335.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/2trrujghprtujti9nnn4nsf3t3/10398646417.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/20046397730.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gofejegix.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/30934571337.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/futif.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2e4fd303ba93113bc7b846597604a71f/jeriwedarusilutep.pdfIn PDF document text
    • https://seikico.net/img-tym/files/65174432611.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/62kkv5s8v51in43trqgoge6bg3/pezelegaras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=flute+notes+chart+pdfPDF 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16704 bytes
SHA-256: 34142df8cce3300b6f7b404931360dbe733028423943ddd77f1e5715dd45d16f
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10700 bytes
SHA-256: cb945aaf7bb666d74aa849d4b21c7543d943865a28fb5d61c9eb9b10c93d9934

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