Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc926398629b048…

MALICIOUS

PDF

104.6 KB Created: 2021-08-02 16:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fae75eb66cdb649ad827682252de3881 SHA-1: f6abab6e9972ffbf7e216ce20323bccf3d7a9455 SHA-256: 7fc926398629b0489d56e7397f1d18dee2a19173097b51f34d36d6fca779b054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=8th+grade+grammar+test+1895+pdf', are designed to lure victims with deceptive content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://nomylo.ru/uplcv?utm_term=8th+grade+grammar+test+1895+pdf PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b272e42f06bcb73e5b0cb49978428135/8400138509.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m8bapggb51qijue24tt1ussh71/vovikosulisoxusegisofuzid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37803eda08---50145505230.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f1843df0---nazemiwitemije.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/73255977102.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/zigezoforezanabilogap.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/498b1597be2cb7283dd41c9abce49680/dotepebuxuvebetewose.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/20396451455.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608869db32eda---rudibenuriladawirub.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/migifade.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/rotogesujuniwiki.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/49912319370.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/59451349249.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/28b421229db64c8cc80fb88328be11be/jugol.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/73287599959.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/849323949d33ebc25f479700e996729f/94034083160.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/piweronove.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde767803ee.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/24ah8h8lep6g9kdl1mjiamv1cv/zozegamogogivogajuxi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nejatanumividuvon.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/da193be8a0eee3bc973bb7d3005271a5/52694176050.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a9b9b6a15f2ce73e86ddc148c22795f/1970144341.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wujesekoset.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/3224771809.pdfIn PDF document text
    • https://xigmatek.com/upload/files/19797490961.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_off000136df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DF 11048 bytes
SHA-256: bb4ebff9c8eab035d9255ae99690b89d91aca3f6e12b72a922c34605278b4667
font_01_sfnt_off00015087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15087 17412 bytes
SHA-256: 23ab8e53fd3457fe54119ae5ff47687dbe4bfbdb3618611e8bfbab6123b71085
font_02_sfnt_off00017d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1