Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b3bd08d1e0d1b6…

MALICIOUS

PDF

95.7 KB Created: 2021-07-08 07:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 228fd568e927a9a08ca1f298710f8009 SHA-1: d82e92562750b703858829b7040c1112d51c30d7 SHA-256: 04b3bd08d1e0d1b692f87a38fc2cf97d99400fa8e2dbedf72558f1059b25959e
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://drafthe.ru/uplcv?utm_term=friday+instagram+captions PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b7584dc9---72316359233.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160971e637e55a---19663768656.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/48721021558.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7ed4d4088eb530f825a820f56612dc23/selukefokiriwonezovad.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/11265951530.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/9414668182.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wogusenasubuwazevipiwow.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/41096540127.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea894340e4---10420484297.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c66ca732547167655cd51b9ff593d7a5/97703650047.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/13555179854.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9772959d13---68877881842.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aea96fab0312c558885194606ab89d45/toluborarolojero.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3d448e46e739d376ec5eac2f2e58bb2b/wadimodobinerasozo.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/dogarita.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/94643258203.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609bba85dfc6d---15484238017.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075edae55498---51561633735.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbavj205cdulh4cimrblv72cug/nanejunofovizokenidudor.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/65999288943.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/xekebekagepota.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/rirapujigazefodusen.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/51941023609.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb965afeab---milaruzinupenubuzowevofi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc264951a---nozijedoxelafuratisudip.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17636 bytes
SHA-256: a0fba88a29fecad2455bcab1043bc1768d21a6dd55cb65726ae6f8bf95f99bb0
font_01_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 10772 bytes
SHA-256: 36d528282f15addc95d102ece3625e8614493fd80a15a1a98884d1b09996b91f
font_03_sfnt_off00015489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15489 18616 bytes
SHA-256: 1b44544678e26ad57e42195f98f3fbeeb0d32cc6e9ce1e7cd380bebfb1cbe32b

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