Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c0b26d049d44f0…

MALICIOUS

PDF

93.5 KB Created: 2021-09-15 20:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e16f0ec7d3ef5a854c7b8e69095d3b9c SHA-1: 8573854a7f387e369b1fd063d3f59f42b14b4ae4 SHA-256: 91c0b26d049d44f0d8b8e93d1c29bf7ebbc0fbdb6ec628f3f78174104d889ffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a URL with a 'download' term and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=download+mobile+legend+mugen+mod+apk PDF link annotation
    • http://smcertificationservices.com/userfiles/files/93270523185.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/wizofas.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/52265208562.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/94573000403.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gopetopa.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/61334895092.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a7e1cc1e---bevonakirevivujid.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/noxurokuwekegojukexogul.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141230d03741---6108394879.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/126131671461310dc824022.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/14413593942.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002e7d89ff---52833051298.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xefadumalulazebazi.pdfIn PDF document text
    • http://all-premium.com/user_file/files/52245996697.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/jadelogijubimenod.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/nofomarod.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138267ac1c0f---26622586025.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/55995591039.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vafewimefazukagofumusaru.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/lidikuk.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lerimejubiba.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/18915054965.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nexotawosikavugi.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/zukopemekomedadodijoruwu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/41047160618.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/94504063337.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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 22004 bytes
SHA-256: be33ce5264652c29df049f8eed099a842dff821accaa80bc0662e2586ac272d7
font_02_sfnt_off00014fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC8 10788 bytes
SHA-256: 3676606b9287d744e213a921a7a1da5e5ce7b066f80b1bdf8c5da7538363cfd6

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