Malicious PDF — malware analysis report

Static analysis result for SHA-256 270d4a7b2da1479e…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 19:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 989216961ac8cac72fbb5ae72d91913f SHA-1: 181cfcd4a5fe24c7c6a2b7b8feaf2d7dc94890d7 SHA-256: 270d4a7b2da1479e14eb82a318b1d43d5c721b2ced34318488e7465f8fd03e91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The embedded URLs likely serve as lures to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=congrats+for+new+born+baby PDF link annotation
    • http://amctop.com/board_data/editor_img/file/202105100429.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38b1d5b652---nokixe.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/vuvuwadezawowuzufedib.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/92731357497.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a7rssnede9p7k5smaqs0bveog6/kafixusigi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad605d24c0b---68814611971.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/s77ol5cl7prjhh9rqd6cn4i19l/84129590285.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/80673670129.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jelorabek.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/zaruzabisilakekarepise.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827791e762b---69084413875.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/77958f70f02956487a43fbfe6a6f359f/89675242313.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9rsuhfmfi3ova7rhqlto7kr1c8/83046590418.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef8fb8a82d---6700536795.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/l96i6e156fg2kj2plu0kbu3mcl/56791227470.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef2cc3e2e---zejuwanarevurenitagu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/74130814153.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/witidibufos.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xejenotunivopavov.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3ec7ba958b4d012b93a8fda252d23e33/ruvifurixowegidoxig.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/3187919237.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n1ftmb2tgbso6b415hadclol4j/pepowi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/medutosusasajokixo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pisapozugux.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67545ccb5---dajagofi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16108 bytes
SHA-256: a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 17204 bytes
SHA-256: 7490bb03038da675027842b501790dbf98dca0cff82454954658b88cccf3b73a
font_02_sfnt_off000136f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F07 10620 bytes
SHA-256: 700a7598151a4083d63af37dbd1e3e7f933ef4cff6d916e2dbd8d8357c3ebfab

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