Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5f832d6be98cf0…

MALICIOUS

PDF

88.6 KB Created: 2021-07-16 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07e0ea736ad2562ebc8582369eecf82e SHA-1: 2bdde4767c6246016c8a6728698f756436e3c44b SHA-256: bd5f832d6be98cf0a1d8a693e5aca75f46b5c0328c3d5a2cb1a23cd2ec4bd7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://asset-books.com/userfiles/file/lofaligeditukafujimuwej.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085991c80d43---sorim.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/teduzad.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18b054f51e---pedadizegudunonozepape.pdf
    • https://talleresimad.com/images/subidas/files/45184037883.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc408d6583---99494288724.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46ee7eb78---xilimix.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84214da33a---5046877500.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1345130a6---90490983769.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c88686eff96493210a0f0513b2c17c91/faxapopafurabowox.pdf
    • http://pensionpoint.cz/userfiles/files/54607333482.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/etu2ujk0aggrdfqut87g8lgv7r/komapebomiguvar.pdf
    • http://clubesquilacoma.com/uploads/files/bumibigilibizagan.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fexiwibofoleze.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/98985094986.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336287e633---14782323180.pdf
    • http://champaigncursillo.com/userfiles/file/pijupofalopedukip.pdf
    • https://2acontractor.it/images/file/47944955185.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65ce7b764---sutam.pdf
    • http://metabolit-plus.ru/files/file/32212462179.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ef80752f---16814119566.pdf
    • http://blpest.com/UserFiles/file/57897579974.pdf
    • http://studioaba.net/userfiles/files/82027805350.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fast+and+furious+2009+full+movie+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f339.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 16792 bytes
font_01_sfnt_off00010b50.bin
987a9ac2e8b01c4c7fe532faf531d51586223fdf012407ce87afb8e86f02e889
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 11292 bytes
font_02_sfnt_off000125ed.bin
1fe1aecc1ddbe6f0b2ba14d24e34bdd7d41e07b21c58a338e8be18cfcb649bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 17400 bytes