Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23068a227741727…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 06:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20bbd8c1e125346d7b556b0d969c1a80 SHA-1: ad21dcd566aa61679763fbe984cfad2842e2e002 SHA-256: e23068a227741727a9c69908a7b2e2f5340ac591de47a2b93c668316ff465391
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term_redirector=True' further supports the idea of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2c23f2cab280722359017614d048b5b6/fisejinusaluzelabere.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/44ohkb84d0scle9u7oacro3q00/61876597393.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-20/20210820132336901585.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611738c024c74---63008987438.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/14682351007.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7c9686dae---40957144481.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kitikafer.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/28518b8868100b82332ff26db835bb46/69846281123.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/lowosotobekip.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6422621d0---46070837157.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/83057896291.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/19526149726.pdfIn PDF document text
    • http://iwishop.hu/file/26637065040.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/97615100482.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160776ee49bbd5---34601596627.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1ba59061---tojoxonibokexijodibivako.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/30400482263.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/betikutev.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/27314442595ef03a036e2137d2cf4874/40077881363.pdfIn PDF document text
    • https://beautydent.hu/editor_up/36271433712.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/375182799270b370520242805184436a/95664747091.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6032438197.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/33111665425.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/33260572339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cape+may+roomsPDF 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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 10216 bytes
SHA-256: b75bdc75a92795bd4d39a2ca617132ba7e7eeacadade0ab4bdd407a1e47bac47
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 18076 bytes
SHA-256: 1c560276246efe4f83a72b224b1dc02f941236d7ddd188913d2a85b09483fc86