Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7f8c4aba853de4…

MALICIOUS

PDF

100.0 KB Created: 2021-08-16 07:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0637d61e1a5dd224ee763685cb0dba85 SHA-1: b3a7342a866bf5aa3968c589e6714d80e62dae4d SHA-256: fe7f8c4aba853de4864fdba28181ee712e811fd71c135b14ae7c6469d459cebf
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://artasedanasingaraja.com/uploadfck/file/gerij.pdf In PDF document text
    • http://haai.org/upload/file/jesusuvogitidali.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c83d3631d---8661642490.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zixinuxudeweragu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/34486366279.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/1535418166.pdfIn PDF document text
    • https://latework.cz/soubory/32054827075.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818fab06e9a---16038991220.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be461ec36---woxumetemifaseviviweroriw.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/30114974305.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/zajuletavilutilapigo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1157e6dee4---61837915412.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/56367558647.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riviwuxogojovavabir.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/33551059791.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2e53334c865f5b8fc5548abe0bf29a81/fajelabilotekusexav.pdfIn PDF document text
    • https://mnlex.it/file/8302843764.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9a6eca12d801f91871c7f773c18af3ea/kelamopurobinixagegoreme.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/98608025116.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/rawomibajewenolalixapini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unblocked+games+66+dead+zedPDF link annotation
    • 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_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 10888 bytes
SHA-256: 1b88293e2548d921bc3cf0f3af2f0b0b2913ff809b8629b8e4962e8ea469e557
font_01_sfnt_off00013adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 17868 bytes
SHA-256: e9dff78b94381b32ed4dcff4ce5f5568954ceb7adabe9601f163ed617e3f4928

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