Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd73d9940de7bee…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 01:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20065c415bc69cee5572447a6445c7d8 SHA-1: 3097c8b2d933a2c757df513bf12ff4af1d8f4a36 SHA-256: 5cd73d9940de7beed9f0a37c925a3b2f1ce952a03070a840207b4da6d3bb8a2f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=heatblur+tomcat+manual+pdf PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tujozofijewimuji.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/20400263865.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077185327baa---toxoxik.pdfIn PDF document text
    • http://northcity.rs/slike/files/mitamiwuxovosijuxonasoli.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/75236098323.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/sijowolixujixogowo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/luravarenozarofajas.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dagiwezopevasatakabisa.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/65840033640.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210819115215.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/30641665941.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b6283eef36d97999dea652a7565c8cfe/noresizemew.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1eb320a0e116a2bfce1237d7ae728cba/bovodezubesukezivakab.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210804080216485.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210805230449_0xoywi.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/36979346489.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/54384845489.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bfc88e102c---19869208014.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7229f6d5---5124600681.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/wumabukozexexa.pdfIn PDF document text
    • http://fygl.net/uploads/file/210822502834.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/615198855.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c29cf0b01---niked.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/xenakawevukorenofe.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/11955454215.pdfIn PDF document text
    • 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_off0000c0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 16344 bytes
SHA-256: 7e506c0efabf6841db590ad6fc59cef22c37f8c279793f2a00f62f9cf23a1aed
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10752 bytes
SHA-256: 3c54eb9d56aa6ce0b2e7169fbf55a1915f0748fa531536f5830ff43acf2b7228

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