Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d8f98b2b33b212…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 05:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ada6d7095821ee0115a3e2dee77f650 SHA-1: 61e897590a5a1f9758d9caef3a8e5c0324c80e6c SHA-256: 23d8f98b2b33b21220fd4945fd3611442d8643ec2fd056bbb561dffbcac8b4d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elearning-chemistry.ro/userfiles/file/13409941118.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/35503902719.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f45823db5db8c2a99833508fe4042ae7/35401370812.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/kebebita.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/53846288230.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mejeli.pdfIn PDF document text
    • https://edbcagliari.it/file/babofekadejivoju.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af7201188e1---tukupulopetewesaletis.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b62727512---61322851162.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/13193551573.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4816c079e5---69955528508.pdfIn PDF document text
    • https://argumentua.com/i/file/81967310038.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/5698811157.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/58944359765.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/fobavavolofoz.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80836578213.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/kemotibazem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646b8ae454---39961901700.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/61404026371.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/50373436823.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea90ea91---13933499128.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/21805123196.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/72949045139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=voice+changer+during+call+mod+apkPDF 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 10856 bytes
SHA-256: c202126014b17473492965f4bd9868dd3e53031b98caae746bd970a2f77eb152
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 17452 bytes
SHA-256: 692c76bac2c8f45c838c855e0e8f5e7a89a47d6ff3a647b09e7fe16a8ead7ce9

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