Malicious PDF — malware analysis report

Static analysis result for SHA-256 597fc419cb900140…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 18:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b2f154c4e37290dda86da499374ea51 SHA-1: 200f4a61ce734acfa5ff31d3794b9e2cb750c8ea SHA-256: 597fc419cb9001403825f283bd8ed7ed6ed72461838468ba3c3e25ae8157bcf8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/35357053365.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/l85gecurovnskoffu74omrghm3/62795402627.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/nukejeniwukolese.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/27547410533.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/74475572641.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2548be41e0a3cc923425ae46129dfd4b/62829314362.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///doniwejigedewevoworofewe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mesujovemofijetijabiliwa.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/32374011463.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210831_1C269F864E959A56.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b9afcbf060d7d44c1b312ac3551cbb61/vedowonubajovow.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/79171499550.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/divev.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cbe6e8d1384f456881d33366b2b7dde/kulemubudu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd90acfe5---13980377191.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/jitunikota.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/nevizugozenewizew.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/jonemifakopimavevugopuz.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/punakuputavik.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/jidisirupixigo.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/96916992891.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/josixokit.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/wivugotalivitefofajob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2019+o+level+chemistry+paper+2+answersPDF 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 11272 bytes
SHA-256: e7c89220ccec5aefcaed4e6e78695b1bae01d6bf8b48296e03d92ee556c514da
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 18444 bytes
SHA-256: a541ef253ec9d39d93c2195ff8a47a49312dad1e1e926765b611696c52f0c5fe
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1