Malicious PDF — malware analysis report

Static analysis result for SHA-256 3effc3c47bb22200…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 13:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a1054ce52a7f25657692a86b87dbc9e SHA-1: 4e00a58b7e4c0462fbe7783c8df111bf25807531 SHA-256: 3effc3c47bb22200c41d65e59c3c0c6c72e15746ceb7e660698f04946f122ea7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary function of this document is to redirect users to external, potentially harmful, content.

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 http://wxeina.com/userfiles/files/90333985532.pdf In PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/78340603443.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffcfcdccb---levumawofudegorireso.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/devus.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xonikulusatimu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cde03b8c4a81d5e1a16b8673e2a1f92a/99776404098.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad93058479---pivelibepeliv.pdfIn PDF document text
    • https://seger.cz/userfiles/file/60932813876.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dc2bc229---22147025642.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wukobijeb.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843518df4fa---sijixisiw.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/pofaredetalomud.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210722_224247.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ed7ed179b1663d2c03b49fad7a7d426f/ributedekevija.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8dba9b0f65232d16e929a686e7b47a47/vuvugilufa.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/78973453996.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/73458655510.pdfIn PDF document text
    • https://mihalex.by/files/files/54775391522.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c840c57c04---juvaduwavelugifulowegu.pdfIn PDF document text
    • https://equinox-e.com/upload/files/11899281899.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/28256054911.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee316de727---lulubujo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e7ffce8c2ea9d399c2504d20b304ab73/badalalawaginib.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/56587473926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=aprendizagem+teoria+do+refor%C3%A7o+keller+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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 21052 bytes
SHA-256: f25a3d311142995c504a41bbf5c8c3c8f43f4481ed0ef733950cdd897e1ef448
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 11004 bytes
SHA-256: 697f6cc8406de04074db56dfe06a9c4eb3d7ea03fd063495a304e8b9e78e586b
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1