Malicious PDF — malware analysis report

Static analysis result for SHA-256 8547f312865475d2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 13:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c9200d350019bfdbed6c0f988ebcd61 SHA-1: 8951a9a1e7ac2d0b238d071f337fc640e5583869 SHA-256: 8547f312865475d20646d4131bce2392853547dda7272d6e7dcc89cc839e4b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by leading them to potentially harmful content, aligning with phishing or malware distribution tactics.

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 http://dtcguild.org/clients/80367/File/tadalavadiguniwina.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1610e45a09f9a8---mufesuzizedudebixuzogivej.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/63949292704.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/remapasebanutimoxedege.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/ledakimelefijaxosadure.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/tugufidodadawunix.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/wosujexajiji.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92cf9af16---31784891353.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1502cdee---48681069682.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608704c1b8af0---lagipowefafisatu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b00b9bacf2886ad743bc6b9c8449f18b/punedalirikop.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee108da7079---sakofobokoxu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/rafiwadowanavewevebam.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/rosowasegitapa.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/34142115739.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/woxulajaw.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac96afa0c---44140623117.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/41560536263.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/bec4a6f524285cf41269ccc322bc03d7/25049956457.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/zivigerosadevapaxuve.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/17481230520.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/85218484868.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/35354345329.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/lulanitaxumen.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eddef0537---vudefurosomurozoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=melhor+impressora+pdf+gratisPDF 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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 18664 bytes
SHA-256: 5b887d7d5f7b408347ff39ac058f4e9f399fd56c424c2d20385f6d173d41459a
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10832 bytes
SHA-256: 367d41e09c49750d5acbdf68e09e6c0f49541870689747ae9db945ee69af17a4
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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