Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1444a4e995a7498…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 15:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd45914bda5ef590e99fce66cf6e860b SHA-1: 106668fb8571dd9b809033510c8eff7ab8236de3 SHA-256: f1444a4e995a74986f17e7c903c6f5bfe90e526c6937b17b83785db0b3f5d7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bratislava.topenglish.sk/app/webroot/gallery/files/jarazakudegawopazami.pdf
    • https://digireg.dk/upload/90865852121.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vusokugawivasetese.pdf
    • http://rayer.cn/d/files/fojisikikifawuru.pdf
    • https://oriontradecom.com/ckfinder/userfiles/files/66461761781.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/52337097021.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631004935.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/jedifajalomobosaz.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/deropuponuwukitomex.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4059c7cdd8daed2751d0f5442a4ddbbd/zozagebumabakimaw.pdf
    • https://itscebu.com/upload/file/20210902085005.pdf
    • http://directopinion.biz/uploads/FCK_files/file/luzinopuxesibomifu.pdf
    • http://factorycontrolprojects.com/userfiles/file/xorufi.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28664456817.pdf
    • http://cerritos.songhakbbq.com/uploads/files/92112113096.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jarizewaruvumun.pdf
    • http://kozelsk-adm.ru/files/uploads/files/57050762052.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f96365257---84271439732.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613252de5e793---petubokavadugapitaxu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b97013bf708c54f23cde0cc53343f608/91693272199.pdf
    • http://moneymaker-gold.de/files/70956041324.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/vuwazoxuxiwipoloroj.pdf
    • https://butyfarm.mm520.net/userfiles/files/15230903145.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hydraulic+press+brake+machine+specification+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_off0000d5ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 16792 bytes
font_01_sfnt_off0000edfe.bin
b6a5adc42affbfc7d5c42d1cf879a12a535c09c8b2064131883e386571bf6150
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16776 bytes
font_02_sfnt_off0001198b.bin
ad634128b8c7480d770e255c68d1992f964c9841c918c10382653ad37ea52218
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 11324 bytes