Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d283e2a8001a08…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 00:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6d128d1313b2d3c5e9e13fd88d32cc1 SHA-1: e3fc10ef09f63f8c811c77d10b4d14efa3fc9f12 SHA-256: f5d283e2a8001a080ebbd8338329b8730fe833b374f7506603e4c325b41879cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/32a69d38f9bf3aae7c7123a1cac25c64/16665028675.pdf In PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/668fa53daff5e1a5d5120048a8d813d2/37498974241.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/xowofipisaze.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56ed82867---35783012049.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054683a3a12---4024613394.pdfIn PDF document text
    • http://farmina.ru/uploads/files/59789694402.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077286d76dd0---najilomiroj.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/40705378191.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608631b3873fe---64190406710.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimiribimosuvigogakev.pdfIn PDF document text
    • http://www.emailposte.com/pictures/puxesasafutigagezak.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gakozow.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd6d7cbd8---57075877723.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e5ab855677977c14f96628c166d1c43/vojinuzofosik.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/4176686943.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/89451092354.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/edrcc2dkdhd5im44dhm60c7cua/pifimajofavaxi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc17617da---kulupexuluridodod.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c865545b---xidusufiniv.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j0nh51t8nirs7l9sccvpho76u6/70018546628.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/terotefuwefalige.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/waxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mix+design+for+m20+grade+concrete+pdfPDF 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_off0000bb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 16740 bytes
SHA-256: 7d8f1daaa8f8deb72c328b8fbf396d00bd2710ea1424e3a559f2ffd51c182ada
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 11256 bytes
SHA-256: a90193f0dcc9de62186ef8bf15d824607cda86fc5d65a873c579479661eef58c

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