Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5181c4305abaa9…

MALICIOUS

PDF

90.0 KB Created: 2021-08-19 00:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc13333e8a8321725a2d5ef831ad534e SHA-1: bb941234d6edeaa4eea0f10d432a298c2522a225 SHA-256: 4e5181c4305abaa98e51965e8a3589f67e687722154b465c8a5989db045986f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a likely attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d8f9e6d6dbf79f95a537c9275a9b0c65/89983818551.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4ea812a2d94a876d24642c587b624a62/22149922982.pdf
    • http://tokyo-sanritsu.com/userfiles/file/bokiwufolur.pdf
    • https://global-product.org/CKEdit/upload/files/berotapexinebibetogulexup.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/967940302.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dc33f8a4---poloxilafupitoluberiwez.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cde039d0fe978bbb2f5d2db87d6253a2/zorigekijexatiroxigir.pdf
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/45490688013.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100dec6e60eb---59507626844.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/gikelijilamubigazev.pdf
    • http://sosnovgeo.ru/userfiles/file/5335095650.pdf
    • http://www.tokyomagic.jp/images/library/File/mufifewoxivubalu.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aea9b212e---52779458460.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/n5frv81kap4nno6p9m6lilmca7/roberuzowe.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/98292180889.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf8617537---82752596922.pdf
    • http://deepakbatteries.com/uploads/file/21370370742.pdf
    • https://b2cexpressdemo.com/userfiles/file/98438395249.pdf
    • http://sevoir.hu/uploads/file/xozuseladitebusuzik.pdf
    • http://rogersdesignhouse.com/uploads/files/mogupovibu.pdf
    • https://camgloberealtor.com/userfiles/file/gopetalej.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b226b23c3a9---62025115494.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839726de6f6---83728836457.pdf
    • https://autoprofi.ua/userfiles/file/2237720081.pdf
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=end+of+watch+stephen+king+review
    • 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_off0000f725.bin
5824188c66e8ba683aa9639405d85a81574cbb4c0455e4976b6e3a04973e07af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 11080 bytes
font_01_sfnt_off000110c5.bin
93bc255341679ec1cfbd38c5db67bc6675401efe7d9db324121a65669bc02956
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 17912 bytes
font_02_sfnt_off00013fb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 16792 bytes