Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7896407fe6f4a3d…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 02:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10885cfc54d017b19aa8ae77a34ff27d SHA-1: af1b4bcca2fe290928002b7ae792a7376449b88a SHA-256: f7896407fe6f4a3dec8bb05bd43d684d7ab567d8ff7448aa04d45f4d1a348d4b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites that host other PDFs. The presence of these links suggests an attempt to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3ab714d2---92446971429.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb2cca1a8---masotijeziwaxamumabupo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc74cc82615---73104718010.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/88178024256.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c88478729a9---58099571082.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523211347888275.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/11191749804.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/1591300712.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061112542373499.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/rudilebojevuxu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca82a068aa5---fofexotixos.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8a18c1c73d896e5476d644b6606ef551/16977636999.pdfIn PDF document text
    • https://kede.org/userfiles/file/dezuxofit.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/cfsjfgssoia811vknpdtdkrjq5/33380504635.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8bf3cc30e307b570e8dfbd9b5a1530ad/34211660369.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/4753889656.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb976b0c26---72965766739.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/39079378785.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700bdd35f57---kigakidojejilidafigas.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd5a2d75b---69340014567.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/jinukil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b530cb947a8---tuvugolomoderewadi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ebd2f8599405d8150465ba51acd35640/fidaniroware.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/52593958239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=insert+pdf+into+word+onlinePDF 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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 18176 bytes
SHA-256: dac456452b745bb0a8a420d676ce50eaf028d187d87a7cdf4294317f84123e86
font_01_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 10364 bytes
SHA-256: c695dd7a909b68d68fb6a56a90ad77b2c064c0e8c5204c37d74447ae953f9a43