Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a20cf07b0646fdf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9fef893e07a330213d654c13ee0a3bd SHA-1: 0359132a958cec8b00eed54901bfab0d49a2d999 SHA-256: 2a20cf07b0646fdff99470d05512871c1ceb693eb690068cbd5676613eee773b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which appear to be part of a link farm on disposable hosting, suggesting a redirection chain to a malicious site. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a common tactic in phishing and malware delivery to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://laborke.ru/uplcv?utm_term=phone+lock+software PDF link annotation
    • http://premo.at/userfiles/file/fosamizatetagasanajagalu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/perivopelupojo.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/52936504925.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/68287309223.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/powodob.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/7530596752.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35178407090.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitibezu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/pusesepusudodolozirezoxa.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/mabumituxanupugaripug.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/11742366375.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/fbf3d3bb28cfe86c808ffe398924f679/jelupazafemofajuro.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614219dcd94b1---21355067300.pdfIn PDF document text
    • http://njchemland.com/upload/files/juwozefudesof.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/21122445265.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429b697c3fe---80031393839.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/69913508322.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/29307569441.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/ralamulemasej.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/parajopipizasazuxa.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadixelesozuduzuzud.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wagarifojuzuga.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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 10520 bytes
SHA-256: 338b6a32540c27b7ed0e5133e93fa0a9960fabf69ff893b2876b36bac922afda
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 18780 bytes
SHA-256: 7dc4849605da690d7259a0a364dc53a249bdec8a19c59184a57a072f63ca523d
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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