Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec369e0c086c2ce…

MALICIOUS

PDF

127.5 KB Created: 2021-09-11 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e8cd0430fa2907228ee8eee6e1115b0 SHA-1: 929302361ab85217c93f2e6e1b798fafce283f1a SHA-256: cec369e0c086c2ced9df55665d265886ebc85cea4121266bd79a0d23f5d291d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that form a link farm, directing users to various external websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely used for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=tera+warrior+chain+skills
    • http://ladyvenus.it/userfiles/files/65412608124.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8be3534077af7998b43c85efea05256a/pefanug.pdf
    • http://astmasme.com/userData/board/file/22682040288.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300935032c4---gepidipesenuwukunuteseja.pdf
    • http://alanaf.ru/userfiles/files/44111222051.pdf
    • http://insuralead.com/userfiles/file/52189080765.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99388330601.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b8844f54---16431738091.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/rulikuxebanebitanek.pdf
    • https://holcom-wd.holcom.vn/webroot/img/files/jikidogapizuf.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/nopavapadezoku.pdf
    • http://viprealestatebrokers.com/userfiles/files/71331225311.pdf
    • http://teamhead.net/userfiles/file/rujivumademasasu.pdf
    • https://rentcar888.com/uploads/files/202109012118151342.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a0e86da4---41867940667.pdf
    • http://novehorizonty.sk/userfiles/file/15265373070.pdf
    • http://superlitefan.com/uploads/files/5086693734.pdf
    • http://ph-easycome.com/userfiles/file/favinor.pdf
    • http://tcsm62.org/uploads/news/file/86168795941.pdf
    • http://safarekhoob.ir/basefile/safarekhoobir/files/gukometujamexug.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/37704565776.pdf
    • http://pc-driver.ru/userfiles/files/67469915263.pdf
    • http://vo23.ru/upload/file/28875210862.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e7e.bin
6f9d333db2e42d6910405f72d247cd16e39f81d8af2e8bfa9d4d919b4e1d4f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7E 10368 bytes
font_01_sfnt_off0001a5eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5EB 16792 bytes
font_02_sfnt_off0001bdfd.bin
99fe711143c596b1baa93af7f16f8e1724ecdf685e77eadd674a8fa2f5abf5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDFD 19536 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.