Malicious PDF — malware analysis report

Static analysis result for SHA-256 c403f25061b5c4d6…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 18:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7245be6d790293e627f7974b863d29a SHA-1: 3bfa391b4f8b62fc05b2a32d97a1c52cf4c13c81 SHA-256: c403f25061b5c4d68e60f3124c94a3ca062e79192a084533ae380b91aed5e13a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware delivery attempt. The presence of a fake CAPTCHA heuristic suggests the document is designed to deceive the user into performing an action that could lead to further compromise. Numerous external URLs were extracted, many pointing to potentially compromised websites or link farms, indicating a likely attempt to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://archism.ru/uplcv?utm_term=spider+man+gameloft+mod+apk PDF link annotation
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81481623974.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/50975587113.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/95155165777.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51002684358.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343261dc0c6---juxofepovevevin.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/53051257598.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/vazivudadejikulezatumifir.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/84376314958.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8796692c8---penim.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/56779451701.pdfIn PDF document text
    • http://herve-coiffure.ci/files/40725783566.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/lixibesitavovukuz.pdfIn PDF document text
    • http://steinemann-ag.ru/33056565277.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/povegimopeju.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/dumoderikudukavalubetamix.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/doxametuvaf.pdfIn PDF document text
    • https://avenue102.com/uploads/file/2431616006.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/13478433966.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6708ebe0a4464fe331e2da062e1af02/52198592641.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/31731954690.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/wipodubefor.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613f73c542558---mekabopenulizawesuvil.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/51850793691.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/ravobuguxamefesajaxunuput.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134d96f75359---97219254309.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/mebir.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903235024.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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 16288 bytes
SHA-256: a4acfb235540c94e3b54726ca621375324180fc5dd0296855aee22c9b39253ed
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10840 bytes
SHA-256: 5692c5657a739507fea4b9660540473e51b75b62f79bb831c744c07b027a3a1c

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