Malicious PDF — malware analysis report

Static analysis result for SHA-256 993f59f97988846e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 17:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b26d7c5d030efced50e6b1ae41ac1e1 SHA-1: f1f27538243e9610f2114b21defa8c692ad415c5 SHA-256: 993f59f97988846e364f6bf2069da62478dd40edc812d3d199bd2a376173c9d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pristineleather.com/userfiles/file/wolapokixirobilenene.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/33670833208.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160722f0099ea6---99810607546.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6794350260.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/51105767634.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zekaxirusajal.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zipaferivibezodatodevoras.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/29892395851.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f81dc112b---71948705590.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/m84son743b6ies433v76g4nt7l/42467445553.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f78m73dnkvglkb6utp6io77ne7/76904089245.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c6d13d68---77298687023.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/karudewupavuzaroju.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/91157239190.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/96da59ae11f2fba4900fbc4aae847019/dumenolixupunosikedonip.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e8e25362275210f94ee52a9f44c85583/31364099246.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a55b26f6---66655967081.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609bde96d6f62---76806722373.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/38626288481.pdfIn PDF document text
    • http://nicosiacaffe.it/file/30296152843.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210824_19_16_57.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/92848606129.pdfIn PDF document text
    • https://airbays.com/userfiles/file/77401288648.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/wafapemurimojovu.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/delegulawujuxorepukaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=keyboard+shortcut+win+10+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_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 18032 bytes
SHA-256: f7ac4b590113c43b82cf2d5e86771a1c9256e2f1f6284254e0f7f40cc9dff953
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 11276 bytes
SHA-256: 9a87292c568ef9018f09a32e7adb5bb2fd3daf39bd13a90aa2a3f6199160d7a1
font_02_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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