Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3d34166fd89bdb…

MALICIOUS

PDF

93.2 KB Created: 2021-09-05 02:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c59ded9ea572ff012574b3c4e9b3dccb SHA-1: 52f5bc1dbbf742450db97cc2666915b80e4a0bbb SHA-256: 3d3d34166fd89bdb74fae96996ae366eed2d37d9fbc8751b898120885fcabf31
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary function appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://webvitamin.vn/app/webroot/uploads/files/12052901155.pdf In PDF document text
    • https://stopserv.ru/files/file/90740979590.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/zogebipuf.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbae42a6---26965921406.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/74b700b487f2a260640a41cf32f30ee4/38483624548.pdfIn PDF document text
    • https://tsegypt.com/file/busodebikopazetadun.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e8acedf95cf9e6dc7505d4acf39d63a3/karefokoxuno.pdfIn PDF document text
    • http://kisito.com/userfiles/file/rilaka.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/92592408620.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c9537593cfb0a7dd171beb1b307073e8/mupetetes.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/80016106544.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e5d0b98d9---37004873073.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cda5947ce---firogurir.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/fatetamegalaxerevanarev.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/3107010961.pdfIn PDF document text
    • http://millecolori.it/images/file/72286534691.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2596ee5f60a856bcb31e75725dd979bf/27529281513.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/tiwunixoturezupavinod.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac318faee---25336092162.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160791678d06c2---moxesiga.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/56522120202.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd159ea53---88072963341.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/48268273735.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gikibobubixewuweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=como+fazer+fichamento+de+artigo+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_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 10944 bytes
SHA-256: c2dcd14fd0dfcd267ee3d8d2b9a21e46da013043769e82ed44cf8b774eb3ed28
font_01_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 20744 bytes
SHA-256: d0f42962d1e19e3ba8b6c4df89ff4f2708b29ef37841a10ba58579f46a2591a5

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