Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793ec46d0d2dcd0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 10:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf0384aef2538769508dfe74640f2eef SHA-1: 9e5c53f3055ad98400b1784e96e010393588beba SHA-256: 8793ec46d0d2dcd0fba1e8791ed44dbfbda5b1d478de8aae648f6c57941d7f87
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a possible SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62fce179f---xibukamejabenoworege.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/22705990752.pdf
    • http://kirakuramen.com/uploads/files/fezevaxejififawetofav.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ppvpitdeeoeancdc7dmdffeq12/46931337444.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/k2hl8ij33l3mdj21l32j5ou420/69498387195.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0m22m8qne3fmga6ph68q709qvd/dewojidalutit.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd56965cf---81774358720.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/80565746288.pdf
    • https://weeb.nu/userfiles/file/28850938404.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/86f770f0d8e42f047d853cadf1277479/dekemi.pdf
    • http://khacdautron.com/Images_upload/files/zakabetiwep.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9c4b9519---8908733379.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/36113145996.pdf
    • http://ekolojikweb.net/upld/userfiles/file/xakanedirazasonula.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d48723593---94995535538.pdf
    • http://wumag.pl/userfiles/file/67513794879.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ee3484852---61859662572.pdf
    • http://veno2.com/upload/kojilokezojujusaxi.pdf
    • http://cphs1970.net/clients/877309/File/fefudir.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dacef5d0---97888083130.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/62338c7fab81e09aacc57f6ccc99dccd/79257195963.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210603010849.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujerovidobesoxaworebe.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/gegexamelilujakejo.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e782f3777a6518569a0a603ddd5e1c61/24936012646.pdf
    • http://bycongroup.com/UserFiles/file/29023763736.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=french+conjugation+exercises+pdf
    • 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_off0000decb.bin
3a1d22e4c09f17ed168d52b0eb8d23c5eadf70091b6d038f5a2cea89c1e05208
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 11164 bytes
font_01_sfnt_off0000f899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16792 bytes
font_02_sfnt_off000110ab.bin
625208894a3b67ac4a9cac56eae6708691a5dd932f5487c8f1b112c249711465
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 18660 bytes