Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff11b82a9a25206…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 17:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7635c7581a415c450d672a7c403e3436 SHA-1: 2c3df3978eab9f5567c8d825d25cb82b2e563c78 SHA-256: fff11b82a9a25206cbea3184fd9cbb7b31a8740adc7006ac8548ab33aba878fc
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://abhimaninteriors.com/ckfinder/userfiles/files/1640370837.pdf In PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/fasirudasujo.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/29599413767.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8cb660fe231df82712683dac39c6b98c/88261267236.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l6o96qkluqfevn7muehm3gvgf2/75479478942.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32276536b0---vosupedovosizikuninop.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123bc2fbe24f---99625319640.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/77153992687.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ace18347---dojuladive.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tazijipizodegudokeponono.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lamotuwe.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/22765918434.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e904069a1---79492941557.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/63444960726.pdfIn PDF document text
    • http://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/75568122489.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50b4a5ee3---waremi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f21499b28---tomukutavemajakipebosifi.pdfIn PDF document text
    • https://appprint.net/userfiles/file/41985338057.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/35710491348.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6ad95495a8ee4248f028e52c1798c959/dezovo.pdfIn PDF document text
    • https://kueapem.com/contents//files/94137526634.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/daxemulem.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/88956086125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=operational+and+integrated+risk+management+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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 10960 bytes
SHA-256: 5d49b9de000dad6e1a287dfda89424daca2a264b78f60bebf0443c907c47f931
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 17676 bytes
SHA-256: a1fec4a24473280f1c15c993a8c5c512327a2573ecef198c9bd922ce6d6f5a96
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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