Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8da6ef41ca4bd6…

MALICIOUS

PDF

81.6 KB Created: 2021-08-31 14:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7411a262fc7da84d1f6e71bfe6ff06b3 SHA-1: 119025431bf6d8eaa9e0a9aabd6fc485c6339c9e SHA-256: 9f8da6ef41ca4bd6bcbcb6588818393191ca6ee79a6b03a66b93dc23d529cc45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ohsongpharm.com/ckfinder/userfiles/files/17478924228.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/095945b879cb3a8ef47ead89ae660904/81141314091.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/lowuj.pdf
    • http://aklond.com/UploadFilesfile///2021062814125191.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7fd5c0b0370c49a8545c9623b2f213ec/kulawuvizafamodakatotarek.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/028k6o1ngev3oqqau24bmtitct/98163587923.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/fld6kkr66qsmlsuroba9f64ar1/52862220325.pdf
    • http://placc.info/up_image/bofujenen.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7847c1c2---jimurofoludixamafot.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9dbh2vgs5iviv5qqlpno6jllpt/mifotetepevixojanitekidu.pdf
    • http://agendatourvietnam.com/hinhanh/file/tijuxatemasujibaniwi.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/48215126096.pdf
    • http://wsm.hk/images/uploadfiles/file/guzewunam.pdf
    • http://daimarconstrucciones.com/images/admin/file/14442824290.pdf
    • http://hoanggiaphatland.com/uploads/image/files/pasebo.pdf
    • https://chief-moving.com/editor_upload/file/64313706171.pdf
    • https://maviet.vn/upload/files/61305881076.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/mepukofo.pdf
    • https://machnik.net/ckfinder/userfiles/files/nasepibonaremupeja.pdf
    • https://adasms.fr/userfiles/file/mujozupumujuvoka.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ik52lpnopred96421dvfoiq9q2/22343013414.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb60553951---86999727363.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/46534877404.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da98c1789b8---76473910143.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v46hk5add4t7jhk3b57jnmth02/folusuzulagejawepufu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=d%26d+3.5+revised+character+sheet+fillable
    • https://medlineplus.gov/vitamind.html
    • 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_off0000e0a5.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 9076 bytes
font_01_sfnt_off0000f34a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
font_02_sfnt_off00010b5c.bin
be2c332736eb0b0904625e73c1a9c440258c6688779a69305f472edf9a903d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 17664 bytes