Malicious PDF — malware analysis report

Static analysis result for SHA-256 c190f553d92ccac1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 14:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 280f53c85171ed112399c7edde62636e SHA-1: f3679667eed797b37e17b6d2a9acb2168886a819 SHA-256: c190f553d92ccac125004eef4aad27c0bf7893e08baf0cf7df83e278f900b65c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful 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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1aa5aa715---zitoperala.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc4dadb3c---xovakiwaxuru.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78045616207.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/21244784589.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dvi3bdmcori6gaunrgdqhigj7m/nisatafutezudomeduvizo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f278cb0760---visakexuwovepi.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/maxebulolumuwazotekorexax.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/belakimomeper.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ac8bb2434a7aac4e35ba3e3e1f82046b/82767640223.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf48113f4---67893385799.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/zivapadukaban.pdfIn PDF document text
    • http://qdjshg.com/files/file/jituzomib.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/wufibufigemu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rl8gk1sig0mt6gk2a0hf97dff5/levinulipo.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/nuzabuduwejafule.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/3025166146.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9a849e15459825cfebcc6e180ecfae33/70308831883.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210527230948.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/26418888461.pdfIn PDF document text
    • http://planetamama.ru/files/file/zerajutomo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26195880f2.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5bfb7411---nunoruwileto.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d361f9a54aaae12594f65e591127ee9f/84133565788.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/960a356ef8f056fdd0fe430d6079119f/24228427462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=estenosis+mitral+en+el+embarazo+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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16344 bytes
SHA-256: 4502e8f231e1481458136bfcfb7a54a3182976f14e2a793985d8a90c348a19b8
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10844 bytes
SHA-256: a48fb5607c375b843422660a22a3715699b8972d99c41ac3a29c702772824fd4

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