Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a8ede94de16c4e…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 06:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0295d218ac1077aea6f860c26cc5c5fe SHA-1: 74196e1da4d4dbb6b55d41a295b8c298486bd385 SHA-256: b0a8ede94de16c4e37f4dad3140f73d8f8630a8ff3fdffb97d8764c519801536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://synerhu.ru/uplcv?utm_term=les+acteurs+du+droit+international+de+l%27environnement+pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/xigexalusewel.pdf
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/4200973548.pdf
    • https://sananselmo.com/wysiwygfiles/file/xoweziwus.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/57690e7086bb77577f2a3ff6e9bb9828/1386830603.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/890686a21da773b7e81fecaa44d5c382/silawarugijokegetedijose.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rloeqcuerl29dhoku4js1lsv15/visojifumusiluxewitujane.pdf
    • http://medicaldistri.com/ckfinder_files/files/463555636.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7b7fd71c5bdfa3bde58b3854e6479cee/kodavir.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/634e0a7b35ab3d3f783075c740c7e1c2/36533728703.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/zibufute.pdf
    • https://accuratesearch.com/userfiles/file/6521104314.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416599d79b---bunupexesusumapukik.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefed54d8---78709120767.pdf
    • http://orem.mn/uploads/files/96495757867.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f408e610a3---bexogit.pdf
    • http://alwaditrading.com/userfiles/files/86968969974.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/db69c79e40649c1745d20d5ad4f66513/givegezatip.pdf
    • http://caycanhtuyhien.com/uploads/image/files/15108355506.pdf
    • https://kiptep.ru/file/87041209037.pdf
    • http://tomlitkom.ru/ckfinder/userfiles/files/wufin.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960efe68e6a---71861841044.pdf
    • https://akproauto.com/nbloom/fckuploads/file/39046889812.pdf
    • https://facade-metal.ch/ckfinder/userfiles/files/xukukazowapap.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094616852063---85072675530.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca82a0f4d0---januxewaduninirawajisun.pdf
    • http://perila-vrn.ru/userfiles/file/kokekuwisokapemevik.pdf
    • 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_off0001041f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
font_01_sfnt_off00011c31.bin
0df06adc0758d1f975b5545961f6795b0fe478c87d1120c321d1e412d15ae442
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 19744 bytes
font_02_sfnt_off00014e61.bin
c16ce32fdfcccaf3030b15f8efc52b320eb387bf1396b262440723beaf1245f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E61 10940 bytes