Malicious PDF — malware analysis report

Static analysis result for SHA-256 023f3e057054923b…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 11:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b45ce887be48b3874b43b4ca11de6eac SHA-1: 1a6fd1cd80e6c9b08f43329f186a1734269fc4c0 SHA-256: 023f3e057054923be67a99c841cbf137997fd3a860717125527f6801c3d99561
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute 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 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ankaraeksioglu.com/resimler/files/resap.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161070f1f752b8---xivaxukexemo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-24/20210824175348374920.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2b6436988904b49f83bf4cf2082e37db/jilapezujutes.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/54651466199.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5e08db23d38747f7b63c1a64d0b3576/fibule.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/vadrtbk53dhla7jhgk6kj8h6v4/wewugatar.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/xuwifuxipovobevesevu.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kezijoletolelepiwojaviz.pdfIn PDF document text
    • https://kuepancong.com/contents//files/92881223430.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/31386078509.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2cbb6d9974fb608feee73a719894f46d/duwinulekikalufex.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/23849478718.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cg93lkpqogsqm857g59gtoerbv/dajoso.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/bivevizafikamuxedekis.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c067e5d6502---dolemilezapape.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5d94b6e9---64256492270.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/11527517488.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210604182906107137.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2045937f1fb7084c8193d62ec6bb3a34/59737033315.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/gemeruri.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/berevenujinoboxoxojeg.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bf05e70a368d4f71ea0783316d66b661/45036808646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=definition+of+foretellPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 18024 bytes
SHA-256: f2a108f9fce768fcc8900df4f0b24767d57fc91738d325b8740323bd30c6dcba
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 9876 bytes
SHA-256: 7cdddc8f64ff0a5490ea778d0345995e8e087f0e81bd13e9bc702f1bc4007c0a