Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5478185c6b2ec34…

MALICIOUS

PDF

79.7 KB Created: 2021-07-17 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f77e5fe83e803d573f30f5cdc6bc6cc0 SHA-1: 01fdc923858473ae15245648163fa1b6abf4e11f SHA-256: f5478185c6b2ec347d0b8d32b7a8c38185b5a378abc9c1a494feccdea749d984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests the PDF is likely used to redirect users to phishing sites or other malicious content, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/frqocg2kgdnlh27d9331gkmb86/40016868865.pdf
    • http://motorlustor.net/userfiles/file/naxeke.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/74112690328.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6322a40170---21115938747.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3cf5cr413t2dk927qt2erg9cr9/4142685320.pdf
    • http://rld-carbon.ru/file/vixifararemub.pdf
    • http://booklandbooks.com/userfiles/file/59990707384.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609891f96e7b5---menuwaxapidolurodezizizu.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/tidujawuwopusa.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4796e776c---43065103977.pdf
    • http://turinhotelcompany.com/userfiles/files/48827472981.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b39b18bc28e---semopub.pdf
    • https://thaihoanghung.com/upload/files/kanikufasebagefitekinedav.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4a5bed5---gogaxiloviwezubar.pdf
    • https://le27.fr/docs/file/98627894993.pdf
    • http://cleangroupbd.com/ck/upload/files/7996920468.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ed2f3e363692beed59da7cca956d14f/tipifevufuvonajof.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab925978d8b---43368491159.pdf
    • https://tamphuctriland.vn/upload/files/boban.pdf
    • https://seitonsolutions.com/ci/files/31578796175.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/u9bpem9uri7149pvoqskek99t2/54493262043.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdf
    • http://7tec.ru/userfiles/files/tabazimanekafopisajobuxed.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jazidamo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=quality+assurance+of+pharmaceuticals+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_off0000d055.bin
39926406747560b47623ce42779ce3fffab97cc456655bfd814286cf977a6165
pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 11160 bytes
font_01_sfnt_off0000ea57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
font_02_sfnt_off00010269.bin
b19d7e8dda2e1dd35bf19e17c18d4d6432417b50f12b76fed32b5252396d97d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 17628 bytes