Malicious PDF — malware analysis report

Static analysis result for SHA-256 f259fc866e7980c1…

MALICIOUS

PDF

139.5 KB Created: 2021-06-29 01:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14342eb7f17a2b4797f54d286833e28d SHA-1: d5b989ff3bc0d3c1b2e35bfc0956294c35728945 SHA-256: f259fc866e7980c16ef6e9a012d598a5961508f0592ffb15d49fcdc5ec89587d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The document's structure as a link farm suggests it is designed to lure users into clicking on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

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://smidgel.ru/uplcv?utm_term=the+course+of+love+pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a867de8ed36---27139650192.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608767891bad3---41205899975.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac500ab34---winetexenonap.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/fibidepaketeg.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d228b8b915d53811984df882b7f4d5da/73765277502.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/kasoli.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c85d313e6---60968910943.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ca145db8ce16918eb9b103d1af3b1a2/81094106245.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d3b45959516ffde2a7fdd0a6624e57b0/46125682984.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcde05d594---29364249124.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/ed3fbe677ff0cd2a07706fa9435f64b6/81369199700.pdf
    • http://thunderstar.cn/userfiles/file/20210504105804862171781.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086970607c61---garovamisizevubuna.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6e2ecb6e87db4a7ac7fba9e91ac4b9eb/tokivalodanixewuxiver.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b8586525---sivipikikevaka.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f22bbc479a761285af3f1c7c4120f876/16952903377.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b40351a2---buwurinemomotafilenepamaj.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70571083324.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0cee1ce0---49455524198.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cdc5bd0aa---pavitag.pdf
    • https://renebeumer.nl/userfiles/file/93363514401.pdf
    • http://romanakladatelstvi.cz/userfiles/file/28234493383.pdf
    • https://ruiguoex.com/upfile/files/2021/06/02/nuguvumi.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin
4cf20af051a1cf2859d03afc1c7ee8c230d88649b31ca5591acfd28280c48294		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10388 bytes
font_01_sfnt_off00010665.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 16792 bytes
font_02_sfnt_off00011e73.bin
4177842df1c0aa827b5f255ad24f3c958a2c82cfd0957fcbdffb9a83aefd2ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 83160 bytes
font_03_sfnt_off0001f278.bin
019db3f693c6aebee47ed81962a475460a55c121f6ccc3478ff9f357c57aa4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F278 17400 bytes

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