Malicious PDF — malware analysis report

Static analysis result for SHA-256 119f8a369fc1d270…

MALICIOUS

PDF

97.2 KB Created: 2021-07-18 13:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05aa45380f39f93f7f31a374937fa9db SHA-1: c498fba96d65ae991c4d222dd628d459f2f19cf9 SHA-256: 119f8a369fc1d27007cb0ad8bbbbc484a6440017e3450ecc743f380fd6edac65
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware distribution sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm0fc7t9g4schqaionos45qbt7/93184396740.pdf In PDF document text
    • https://mauspro.net/upload/files/motajorap.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/52ecba27fb3fbb1842bb3218115ba62f/22296744923.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kenigudemi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210601014626.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/rasimojuxojonuvo.pdfIn PDF document text
    • https://unosms.us/userfiles/file/60238301556.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kopuki.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/53539566179.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996c68bb654---74655446348.pdfIn PDF document text
    • https://digireg.cn/upload/48060665694.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6ca657eddcc2a8529c810ede601a2ff4/76512169417.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/43732919478.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/46795488778.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eaa8b4fad---93450461415.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/23796089063.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-03/images/files/11352904894.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e14219b9762---tadipatekuxemanitodoroxog.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/xabofiwezekevixibaxat.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/25890720435.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f25cef0e64825e342d10442234c8562a/bamupewofasurenuvijunubul.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060219509_991107906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=atone+for+definitionPDF 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_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 9952 bytes
SHA-256: 40a554bf641d30e3ed38658ac8e267b382e87fd5cbbee64da474352e750ea7c6
font_01_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 17976 bytes
SHA-256: 0591acd35d97807ade6f5a1b9ced0921d7ce9645c9d1809489decce196a1bb9d
font_02_sfnt_off00015e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1