Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbed6c30fa99f4a2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d89ff5a15019daa54a99ea429c402107 SHA-1: 37197d80162b25d21a0f8f796969d772d4cdeffe SHA-256: fbed6c30fa99f4a29f5cd3b9e6d86ab483b04b17e05b4234f7856a64e4bdfa9f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://markasib.ru/ckfinder/userfiles/files/jivufanaditozatitufitiju.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/99393908074.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cff804be570eb2199e74e60b82fced20/xawidonuxujemusidop.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/povawixinesowudax.pdf
    • http://mosjob.ru/images/file/21997433379.pdf
    • http://ihdbd.org/upload/files/jakamokigojufedizal.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/tukarivafebaku.pdf
    • http://piqiso.ru/userfiles/file/powom.pdf
    • http://sugarfree-gelato.com/upload/file/70607978341.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72ee67d4474687d6bcaf49a5ceb9813b/15210809431.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5d32b0k4m2p21r7dkddb2rbnqp/63259935862.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd9914852---94182716953.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9796086fea8c982bed666a7369eca574/ladofutigiwupilabup.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qeb5qk16tktgg0tf0mj7g1qun5/98464828310.pdf
    • https://egokituz.eus/files/galeria/files/kizozotuxuperinas.pdf
    • http://3asoft.vn/img/files/97578287515.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5m540fohkiuqe5e4ahuiqiqfk3/86400391963.pdf
    • https://osakadentalcare.com/contents//files/zofusipapunanow.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee25d5cc4f0---84107740077.pdf
    • http://suachuaspa.com/upload/images-content/files/dufesebawiwapajo.pdf
    • http://autodilykanka.cz/cmsimple/images/file/70388729360.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e8d1ccf18ecd5344ee3a4c69fcf28c72/56971870389.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=an+ember+in+the+ashes+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_off0000ecfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 16792 bytes
font_01_sfnt_off0001050f.bin
de72c3cac554d336e78dbfc2767d4ebc5da6392e15137cb35767c314ee53b972
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 17076 bytes
font_02_sfnt_off000131f9.bin
49fbcbcd7de10840dcf0f1a307195f61bbf0abf5ffcc46648a4d5624ca594140
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10720 bytes