Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b47ea4efb6289c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 15:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8ab41261ba84767cdf8856e1407997a SHA-1: 3f14f3e9ecd1f5367b4e607e311217e784cfbd68 SHA-256: c5b47ea4efb6289c068d3de4e5d077c0acda8cb5fbf87ede5ad60a94136f0094
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown URLs and compromised upload links are the primary indicators of this attack pattern.

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://clairerolo.com/userfiles/file/gazekivirunopisesim.pdf In PDF document text
    • http://venkateshservices.com/uploads/wutubeligudaxugototibex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf52c9ece---24947998118.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/buzoxivapet.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/43582540093.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/fokutoboso.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/97946977577.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d841e6a1d6f---voninugesidetokifajidama.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2eb932a9---83817722730.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xufojimanozofir.pdfIn PDF document text
    • https://digireg.pl/upload/15991004552.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d242197c5---44437123724.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fesasibizepagupin.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fidewojojur.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/juduve.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/68674840737.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/50824136776.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/setinulukagufafunijogan.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/zemenekerupavodudos.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/susuluwevivewi.pdfIn PDF document text
    • http://4yoga.by/pics/files/26743217134.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/58198270740.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/81446626345.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966f7e37db5---zutesa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6d4f37cd---45380171659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=every+breath+you+take+partitura+piano+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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 10876 bytes
SHA-256: 6616777e33fc8cb52f997de502d67ec8e00c7ba7e2a11931bc0918c615890b97
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 18932 bytes
SHA-256: 9dfcb6973a30428a057f572c6c64c55b08ad101e4fd5c582021ef22329d289d3

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