Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef79a732af8d2682…

MALICIOUS

PDF

91.0 KB Created: 2021-08-07 06:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50003cb2780fcdb8deea6f884beaa9b4 SHA-1: 530e10337fd5741d77e4f3d68772933c25399912 SHA-256: ef79a732af8d2682e273cfb45a41c636ea56b492c16b8542ed6e5ddff3437343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=verizon+fios+remote+setup+codes PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i83shgiptfvjvfmukb4ai07gq3/jedojaxipatojazemuni.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/20705106817.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0accb73d---balulumuk.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9f4b2f7678c060f3f2584e5667fb28e3/87196385940.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/32757483015.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/61afa26222b1e7a47c2387dc8ac07df0/7638708087.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/75260432867.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/70511569752.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bb38eeff4998932aa9b909c3d58d4fd7/63357885936.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/26006794305.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/rozilekobagamozozedebeg.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bduiub2mvb9nhau4p69f5v8tgq/80866943915.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609353d0ddd3e---xifubudisexaromigumi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f708ba65a4---78150677384.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbfba267d---15046362944.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/gezifazorasun.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/80d1a626ec0bc3c0c24b25a1b3374a18/12039952728.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b21d97c16---53321259918.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7b4a8d534a195474ef4d4ea35785899d/gowitekilujipinofud.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/48369277276.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/55274295666.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16089f98e63ea5---xelezosuwujiwubodinutuve.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/98779671855.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/48994971852.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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 17020 bytes
SHA-256: 5bc8766cb98230d86d78d4aeacb6dab7b6cb9136995c7c41039efa84eb17d5ce
font_02_sfnt_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 10700 bytes
SHA-256: 857a4b253c9cafff406938e50f1970cf2a5728321f923dfd65254301c5260d4f