Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be32c2e2b482125…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 22:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c7c45f01dd7e31a40ee2c0f27fe820a SHA-1: 409afb3a65c48c79f130e467a0ca3ea7ad854d68 SHA-256: 5be32c2e2b48212520a5a0fe850d5eb27ef5df7251f8dce85d5ce688f2e98abf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://i-try.tw/upfile/files/2021/09/04/jigikosuja.pdf In PDF document text
    • https://by-express.com/upfiles/editor/files/dokujajoximigopavixu.pdfIn PDF document text
    • http://apex-architect.ru/images/file/54292343301.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/tosudobozi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b713b6a72---nizoxosotigawesevitorez.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/699563758.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/87476075551.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161342a4e95a89---matixopofasojipukemi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/robobenamazufix.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/65098831455.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/49111746670.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/joreriwuvefowokesubufa.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/83006410834.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tubowuzupamini.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kadisezegot.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rutotekitavebujigize.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/kexesubosi.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/86611300438.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/kemudoduvibujibesetuf.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/2401822806.pdfIn PDF document text
    • https://emenu.hu/editor_up/zivulodofodabiri.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328a61b725e---zamevebujaj.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/7643113043.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/toxuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=halo+mcc+pc+aimbotPDF 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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 17116 bytes
SHA-256: 7db4b66ce63a5901bc95771fa70fe84d0b50cfd62486e70bf16d57e60afdb1ce
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10164 bytes
SHA-256: a8eca3b7d78f817a2ebf0dbc123e0619496984ab3874f3d381987831f357418a