Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca550a803c98391…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 23:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33b34ad7fe0840be7e1c235c261f4600 SHA-1: 6f5b44b6da5c82939eef9b7934d6b680f5c6d04f SHA-256: fca550a803c98391aed0a9bb0e007f7c185499a9931ee4d833d590971ada84c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malware, rather than displaying direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=sm64+hacks+download PDF link annotation
    • https://reformedgeneration.com/userfiles/file/poxadinekazifo.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zaxuvisovapasudomugeje.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/38488503868.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69b06916635e93b7cdc8a6ea54fa1cc4/53266781593.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45592963444.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tuwevatalujupifipupanakux.pdfIn PDF document text
    • http://ukrfirework.com/images/file/4696840867.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebc62b2f2---vulotunizug.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210927140423.pdfIn PDF document text
    • http://screen.by/images/file/fanijexi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/pegodibozusiteriz.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/41353115871.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/25937086031.pdfIn PDF document text
    • https://parkettworld.com/upload/files/valezawobowasiger.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/vuriv.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/71685003445.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwokipuganenaruv.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/55170632185.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/18003142918.pdfIn PDF document text
    • http://toonesk.com/upload/tuzopogapifiv.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdec260aff---71444154280.pdfIn PDF document text
    • http://hexindechem.com/upload/files/vimukokutivovomijazepa.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/lupedudon.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/18248862643.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_off0000b721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB721 18936 bytes
SHA-256: cab986fbf5a31b2e010b76efc79d49d935dad24098a5ad96e7a4634f2a1e25c7
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10712 bytes
SHA-256: baf7ba807c2a1542f7214bca12a1ee1a1d6b209e3570bdb90db6c5988d5e91f8
font_02_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1