Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c7001e69f46e0d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-04 07:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c2c328f973201598a29bb0483caf64e7 SHA-1: 22485ee9c904f1149e3f5c334d4ece6cd924827b SHA-256: 48c7001e69f46e0d381b86d759ca75c2889981d737e696228cd6a25bd1bcaa18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=miracles+by+walt+whitman+pdf PDF link annotation
    • http://www.aportecnica.com/imagenes/editor/file/50579209513.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077298f82999---1103180045.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/topisemojelajoje.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/boruvazumumodovoto.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/6f0a5a6df909f83e7c27d7843aef76a9/xomurawusilikudatijigib.pdfIn PDF document text
    • http://jawarakreasi.com/file/gobuvolawadesipezufa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e8445b8933689d77931b8c686bbd3d5/jujosel.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffea788830---8457517808.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fodazutejevezeganavup.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/dikozaruvuvalelujugugun.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a80b0449b6bddaa17e3a0e0ea0df8db3/tekevonolepuwibu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210717165214-47121139358.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/12932965742.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/76904268680.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/womiwidezavewemoj.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/67048643034.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/tovijizekok.pdfIn PDF document text
    • http://cy2hand.com/userfiles/regefolup.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/sotefonezolamezerosa.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba43417a4f---bajavugarovot.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/tagetedixufol.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c63a4f9c0---85983529653.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_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 11100 bytes
SHA-256: 1b15fe58e660e8e9b61755eab15e515505a15fa7cc6170bac7827c057983632b
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 19132 bytes
SHA-256: fb2827472712c5338409c25f5f624acce05c0d27f83da065c22045b00118df7f

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