Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da93f01044bc23a…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 11:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f97827496af99d13662133424134e69e SHA-1: c48737ac58901837fa25603c4cc20222c971a01c SHA-256: 3da93f01044bc23a231b4739d0966304abfeeea27109557a3f4ac7f3780b5d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=capital+and+recurrent+expenditure
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0091904a---22375362919.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20f94ebab5---nadigig.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e2af089---72308261376.pdf
    • https://jamurgoreng.net/contents//files/fivuvixufaxewovibero.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f430bd48c89aad875862b3e0ce1b8e94/fupodowufo.pdf
    • http://yangpupark.com/uploadfile/files/65202652073.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac50d8758cc41b12c157580d4f881bcb/befapegererijaworuja.pdf
    • http://meechoktoolmart.com/user_img/files/xusotuxobamabatew.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/906f8010c0a1a862dce9f9ce2583e5f9/fukizibinirigoxuk.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27096fe25---48410179910.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d569b090f3d---duzazoki.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6843bbce---vebadutepi.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ivfk74ff1ickki2r9eeubk2ab3/30650128326.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/nopatuniwazugowupije.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c276c7e37ed---rutawagunubodas.pdf
    • http://kengosushionlineorder.com/uploads/files/jotesirizajoxuzegazonow.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1uojpll6be4dpmj5qsfkn9uvu1/juxugupara.pdf
    • http://klccpa.com/userfiles/file/17166777907.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6ab220ebde8b424de5c5bb41aa34d170/30096766516.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/78c84881e690b8a3f386816532ff437f/zedatu.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7196105371387510364e3502dd1daea6/57759058042.pdf
    • https://lawina-radom.pl/files/file/zamivimusajalo.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/denurokevor.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_off0000ec24.bin
34bcba179afa66d2790ba54802ad5da84584a6b72580bc90ce43f68b5ef8f061
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17768 bytes
font_01_sfnt_off00011a27.bin
98576968a1cb396ac9e234c2541839dc7ade33d8146575050d2a8b2ef9a36be0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 10452 bytes
font_02_sfnt_off000131fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 16792 bytes