Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9317e9da602436…

MALICIOUS

PDF

85.1 KB Created: 2021-08-05 18:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c01cde5e5c6c9ec7b5913b60c3f9d34 SHA-1: 60695162354853e448cffde771af0d753284f0fb SHA-256: db9317e9da60243673f2183845b09de97cc662f6a1120f2274e2ee86e93695cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of external links and the callback lure strongly suggest a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+pair+jbl+xtreme+2+to+iphone PDF link annotation
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/13224836910.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/52997455962.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161077b746b91b---42945966308.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094f8753f983---81608443562.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8lnqp9omojekhpqlmajohpf6mo/39500582908.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d7261038---22018519218.pdfIn PDF document text
    • http://ymmicro.com/files/files/lirifavodubosi.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e7c557ad---2804748645.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/sepulibera.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/1127733638.pdfIn PDF document text
    • http://emannsltd.com/userfiles/35512462053.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/valenesafamomadunikulule.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/2e366qkvos3na32ch84uggtdd7/5558006802.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/vimibupimekifabin.pdfIn PDF document text
    • http://atomleasing.ru/media/File/sosepupipatebukorupe.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830df52324d---xeladofefuxutomegisuf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hbdh5rsudrkk26o9cb9aap39co/50242630293.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/fonuxefajudetitovipajarok.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/36551654758.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e6b329de0fd7fdfe13cf1428e00c83f1/potorokalupima.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/82198682315.pdfIn PDF document text
    • http://svx.su/ffile/file/tanazuguliwaziwimab.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a230be9b31b---79426230920.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/67482868953.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/53178955132.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/tekibovilumedexisa.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 10916 bytes
SHA-256: 8ac599ce92b644ce037a7d06fd28984314477c7a171fb98464d81f40edcb8634
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 17180 bytes
SHA-256: 855769166697d7e0a8850322ea71932dcaac21a063c67ea1f57808b1b3af353d

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