Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a454ddbeb69a7f8…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 12:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7e4a475570085311e7727ef5284c164 SHA-1: 809f2873e18d07c84a94540fe781574e10512de5 SHA-256: 4a454ddbeb69a7f87401915eb4d005249de3a48f15dc9583ae3ece51ac136a9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The primary purpose appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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 http://www.benyowsky.com/resources/files/46754851932.pdf In PDF document text
    • http://demirlermetal.com/resimler/files/mebegufumegivofupu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b21bd1f16.pdfIn PDF document text
    • http://intergeored.com/upload/File/69910418255.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106141815288573.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609692c1a281a---49002946749.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49ef8b656---duvabaxutupizepixulixikev.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuxavusoxuwazoloxawiris.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/redota.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e448c9ca3a7693e75371e4392c07581/vobiwajuporebowikili.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n08lmlm5g2qcp6ntinovmnc6vi/43778555698.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/leledirefiporowulamadipo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/43425253883.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811218b263e---xipes.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/44428871811.pdfIn PDF document text
    • http://hrudolf.com/userfiles/11976739152.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/savovilefas.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/88680430429.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8255e61b---12680075263.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nirivepipokuluxef.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d6df0c93---zunisovojalokud.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/35160689431.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/1937181999.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lixixopovi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/28254240014.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f7a9f78501c806a599e891288e0977cd/75398395939.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/fipabokebunuretoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exercicios+sobre+reino+plantae+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_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 21000 bytes
SHA-256: a7b4be4cbd4d57fafc269d50d9d27f7c2325b15cad3a9a916325a1a20642e4e7
font_01_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 10840 bytes
SHA-256: d0563f7cced3ca4b3d4d934607947b2438a5ac573321b78b73e9a58108ebf47b

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