Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e45961ce63aacf7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c5cda83c229d175dc66dcd89f2dd963a SHA-1: 17ed15d59c6a31976aa462e46219b75389122526 SHA-256: 3e45961ce63aacf7b32a56a8aaf1018beff5eb609c53fcd937c0ad882ccddd6d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nanyangtextile.com/userfiles/file/remafopuja.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610eba1e979b6---11882666513.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zibuzuxus.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0rc9aqbkovrk66nqaodv7pvtr5/7423541220.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/26203547099.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/27379765082.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/37055463786.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/74731136139.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2646d9db9687fa46ce66ccfe56d059dc/17212450118.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/13390137247.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210821160311.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160739095d92e0---melakavepoliboxaturum.pdfIn PDF document text
    • http://ranagro.com/files/zosabafojipuvaripiv.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/46387047184.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/modesusisumurarid.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/149744ee9be28464a3198dec84e11167/51780082613.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8667431e0---dapibulejegoj.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dc6v64eli6l3sinln87ja263s7/45514400199.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/1b7b129e1812305fdfffa4cfb9bfdc67/94622954598.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wesopaw.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/62628228138.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/bojekejegaruwux.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a671a8a82b89b97cd83c2a9ef67c93fa/vakurebigodanasiwadida.pdfIn PDF document text
    • https://badercool.com/userfiles/file/54518749074.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/teduninubezebegewemu.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/gajufufonirepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=subtraction+using+a+number+line+year+2+worksheetsPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 17696 bytes
SHA-256: d9bab2435cb98c6fef1034af9c8d2a3ac8e151c1d45108c0cdba359bad08a9aa
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 11404 bytes
SHA-256: 87937ea345ce8c7a1ea7ccdffb46536d09570b29a5c503713954e57d6a6bd48d
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1