Malicious PDF — malware analysis report

Static analysis result for SHA-256 c270375b8baecad1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 07:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fbb76c82834d0142ba71f795a3df388 SHA-1: 218adc2a58f544ffd95f14c12cb50682dcfa0da0 SHA-256: c270375b8baecad192d92ac8dff957c2cc8e82fc13a50d6cbb3b6a9ee34c5f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=epidemiology+of+communicable+and+noncommunicable+diseases+pdf PDF link annotation
    • https://sunarchegypt.com/userfiles/file/10168259185.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/xalubu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161145a1c84cb6---42802854196.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d50f14538582206f5de7514abd4904ad/sekidobimuniferusikek.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607522dfa064e---xoxegelimefidetumuladepuz.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/tagowoperafajajoti.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76538fb2bb3cdd678802c2c13a2b670e/86930201367.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160902c6f1bad2---36156486133.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e5b6276e9687859b91b36d26d469dccc/negowilogewasofixupaza.pdfIn PDF document text
    • https://le27.fr/docs/file/39862708420.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8111042b---99821857158.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/73476949186.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/filubib.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fdad0a8f---xudevij.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/nomumesaposofenabevis.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kuxokepu.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210701_756C00F2DA6ED665.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/lapotejotekikif.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/gitejaref.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/44e72ad9e8c313b4a01789debbdf83ed/92046185020.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83f889615---jemododowogoguwusaxotos.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/91597779073.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5ae6498a---41940620745.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/givutegom.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2a237df9dbe90e38368027370ec378b1/wijukeporeramanesobew.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8s0n7htptmhs1lvqvp04j7pcab/88144453054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 11100 bytes
SHA-256: ca324a5617f3db68f58d0e5652016046a4590ec2740871ec8dce52e33cae3b1c
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16640 bytes
SHA-256: 0196472a61f2f51f8845fe2e3c10faa516e5bf1aa8734944e79e3ffafd3aa064

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