Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c04818a97a22a7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 10:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5117030c908b5e2a2a7319f35571a1c SHA-1: a339906566444376e0f0e6d765100af9a5640256 SHA-256: e5c04818a97a22a7b05ce100982d234e8bfc5986f20b63f926ef7dc571dbcfc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=mx+player+to+mp4+converter PDF link annotation
    • https://khoahoc.timviec365.com/picturesfiles/lorofuwam.pdfIn PDF document text
    • http://merwepizza.com/upload/file/99683070868.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/55808307632.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/muriwipewavoxoxinijixo.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/21918449195.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/31556922674.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/378f6507ee23f8645215eaf291bfb05e/81343714985.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/2159344303.pdfIn PDF document text
    • https://izr.fr/files/69550611008.pdfIn PDF document text
    • http://foxhill101.com/userimages/16568326848.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/juwixudabutetezodeweb.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/14068705639.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1hapnqdo3hs48cp4qr3m3omaem/2986631326.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/52602246798.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/lefumaviwivezibef.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/35352767511.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/36dk3ssn75gdkkupum0i8bip4e/menamirigavijixipumo.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/10018583424.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/ganuj.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/wulikonararojifuk.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/wufawoxazun.pdfIn PDF document text
    • http://kodemari.info/data/files/fujokuvalekopopabegepid.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jajuzebasunizotosut.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/04ab21cec7eac1721515be4705728e50/45031461557.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10628 bytes
SHA-256: 982a22652596a02c064f0a400abbecc01b240806767e1038c5f1c60b4967d594
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 17372 bytes
SHA-256: f95c7a3ba63b9800851ba79225d06a39c859d50f3b7bb9fb46913a0832aababe