Malicious PDF — malware analysis report

Static analysis result for SHA-256 55297f7f1c0b25a7…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 05:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eee53f75eb8119a6c756187780d863eb SHA-1: 693d2d2a56416236d4ae8e769d86de713d9c7918 SHA-256: 55297f7f1c0b25a76e391e04e218d12ad8803ec7e991d0f0c843644b86136398
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document's structure and the nature of the linked URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://porpora.biz/imagenes/imagenes_contenidos///rokowozinaxo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2b9a6574---sofovasavawojojozoda.pdf
    • http://xtra360.net/campannas/file/ragofexetitupikon.pdf
    • http://yesilderecine.com/admin/editor_resim/file/medafesusoxabekajiwesebog.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gqa56ucgs19b2i5evdc1bfes7l/9309463939.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a04b9241---31502536363.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/mupizitutiliguv.pdf
    • http://provia-events.de/pics/fotos/1/file/38722897528.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/35598887970.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093fa073138d---32240045211.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa6972c72---gumilidavuwudegefil.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13fd5fe7e---26743367771.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f6f8983f---67977518548.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210612_0FFA1CC3B67FAC2B.pdf
    • http://tksvolga.ru/userfiles/file/31118676513.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f55fb1af4---tawodotesulefot.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0a1460b936d310b381ebb6c5183fa71f/32627292343.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n35ggfkno41hc4ng0163gpattk/73366915860.pdf
    • http://anaminfo.com/attachfile/file/10073660268.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/toniti.pdf
    • http://aliceinformaticasrl.com/user/pages/32978960744.pdf
    • http://adabaskimerkezi.com/upload/file/75831809847.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d18cc5b35f0---15969709064.pdf
    • http://mertlakustika.cz/images/pages/file/66940762356.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+product+launch+videos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16792 bytes
font_01_sfnt_off000127f6.bin
6c8beaa3fbb34d58c787280206665e423283d952f5d4b14b41fbb408a176ea6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 10832 bytes
font_02_sfnt_off000140e7.bin
9b3d88d92fb06518aa133f860163cab1b53a80119859ccb1ac3a3ef8c066b968
pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 16896 bytes