Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f64e4883a5ed879…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 04:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a29130785216efa387db4abb1be6bdc SHA-1: 6af49a038d38eb419e0eb085bdd173fe4cc12f4d SHA-256: 5f64e4883a5ed879ee7c095509a1feb483689cfe09a3db4fe308aeb6941238f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=android+gcm+push+notification+example PDF link annotation
    • http://www.jucadent.es/ckfinder/userfiles/files/tutobux.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/32670445391.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/buzuda.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f11867c7---tomufaj.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/10243397775.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/28288829617.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mawiranimizazajetalavijan.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/40831959148.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/94544682134.pdfIn PDF document text
    • http://m2m2design.com/userfiles/dunemirerifer.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/34252739129.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/94524461972.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jijepoj.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/86081814866.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/sodobonevopixup.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/fabusugadokokazedijodojow.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/960accd5d914252f97ec91fd869af9f0/xibufufekeloxuwi.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/datulikawawalusorexete.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gezavop.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210901_01DDDD5626771309.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a4c2ed0e5ba00c8a6587a1e0d1c5a4d6/miribatanoxifadesajepo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442c8fe05---nuvawixenimejiwotona.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/kafit.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/jitalonakoxunezo.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/28057865144.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_off0000b6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E9 11248 bytes
SHA-256: 99c0f6230bcf5df8dfd5013d5e34da62790d974c23ea17d21c5572e9c05ccb6c
font_01_sfnt_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 15352 bytes
SHA-256: 36591913b3f50a0ade593f0b62ba27387e28deb77efbd65b1cc78ca00f1f02ae
font_02_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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