Malicious PDF — malware analysis report

Static analysis result for SHA-256 6199f250345406a9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 01:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9277d864e0e853a85d1c63b6a4362ae SHA-1: 0579d77cc07e99ef8a62253229a798d21ba1f4df SHA-256: 6199f250345406a960843c1c80c85219e2a8e003a2465c08a8105e546f2dd836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to lure victims to external sites for phishing or malware delivery.

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 http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/beviwerawilanofonikuv.pdf In PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f358bcea40e7f71c2a26f9fec75dda60/86461389606.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078144966a4c---kapulejonotabu.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/27695775965.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb4c948d16---wekof.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/s073c220cbquq6ense8o976rbs/duvakutojatexu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/cfbb75579736d17b09acb4f8d566d57e/pareselajimozosejiluruwiw.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210614_39DB545376B6C2E2.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12c8d611f---riteba.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/mubodepumukokufiju.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/12f522e49eae906c6b22792fda941e69/27874875731.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096650c58190---97368449654.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/14674514060.pdfIn PDF document text
    • http://linker-apps.com/files/retodosora.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/xopusefofifugemetaparo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/9137527538.pdfIn PDF document text
    • http://renovator.cz/files/file/lejidejagi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/98735992696.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/38532859908.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/menivowolunomuputozi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/7736237764.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/94158626479.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160755d9241f6f---49408750260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=primedic+defimonitor+pdfPDF 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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 16308 bytes
SHA-256: 3050d8041e0b938989dd0bb900577115bb5f70e62636f4cfef173d9598afb355
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 10408 bytes
SHA-256: 251b6898bd70d999fd9fd2ea86e97a37ccf60de6aa224d6e9202350c88c4fc83

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