Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ec7c56afea1bcc…

MALICIOUS

PDF

110.4 KB Created: 2021-09-01 20:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f13d9deaba1ccaf030c3af4d5dc784c2 SHA-1: f6e169c72eb8c1a1659525f8163e0810e0fcd561 SHA-256: 33ec7c56afea1bccb026bc41965ba66e749d8e2e9d19b024850c8506f8e2b1a2
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://nicklason.se/ckfinder/userfiles/files/losoburipigorovanuladoj.pdf In PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/vozuvogilologajes.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/suninibojimit.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/59918094586.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/ludinabibaxexomopisu.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/53161855401.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mld1034l4kc1k53hf9cm0jb10l/soxovejasigasobonudotubo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579678c340---warodelusewamom.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/jedonudazuvujuvaxepatep.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8370b8d0---51455581703.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/20811165014.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/towuluxilabujafikuv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79f064d73---20915013272.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd5f39b1650a67d3b115d8f5dd17d929/reremipawogapevi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/12028086754.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e8c83a8e---29955263258.pdfIn PDF document text
    • http://ridendo.cz/files/file/tedevabix.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/zupugef.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/f6gqmgvnb8uegaevjnutps7phr/napuximofesetof.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j5fudgo5glqpearoq9jjqr1mch/tizerupiwutowajosategof.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/vimawamutofurabesuzagunek.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vadamesebasebaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=perry+mason+the+case+of+the+one+eyed+witnessPDF 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_off000146d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D5 19004 bytes
SHA-256: 63519bf6322b6d2f9639098bb89080054886f1462466381d47487abaf3a4387c
font_01_sfnt_off0001785e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1785E 10896 bytes
SHA-256: 2b7198cd799b134b494d0721fd907c4649d53ea2aedcff4998528043235d00ae
font_02_sfnt_off00019181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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