Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe35d57cea1e0695…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 15:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2e6486aa1a655bfb51f9585125f80b7 SHA-1: c1ab98a8787857acda6b3d0ca84a9e7989b47cce SHA-256: fe35d57cea1e06957087c5d1467d37da7aa40f38b2536833fdecd0d7bb43e15e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or scam operations. Although no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=block+gambling+sites+on+android+free PDF link annotation
    • http://tauroconsulting.pl/userfiles/file/vurorisol.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d45b9adcc---90455737971.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/36022524158.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210909_D862BC6593B777D4.pdfIn PDF document text
    • https://eternalbliss.net/file/sejudabug.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/28631378720.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/d8deiuvhekptbsi7p1gon01s6j/beneb.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/22506911192.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/25436736433.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zunesasuj.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/69905204751.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/susotanese.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/tigeririli.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9use5u724iefb1olg7ttqnbt75/76668275405.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109062334177340.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/togexixiniwava.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/gibanowodedojutusax.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1add784d---15109474792.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/20381904926.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109110812593666.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gurebugofi.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/ladefemajudixexabo.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/97841979243.pdfIn PDF document text
    • 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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 11104 bytes
SHA-256: f6acc2c18be779239bec95445f40195d042e95bb38bf789ccaa953fbf7e3e70b
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 18244 bytes
SHA-256: b4758044a93829937f6c54f679a3b91828827401af259917c9351deeefadc8d5

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