Malicious PDF — malware analysis report

Static analysis result for SHA-256 f537d6296c40f0ef…

MALICIOUS

PDF

98.0 KB Created: 2021-06-29 19:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81b4c76c12cab2fe37e4c57152ddc871 SHA-1: 21066f6d5f99cc81269710af7a7d9ae0da69940c SHA-256: f537d6296c40f0ef2b7bc9b3234df334de39fe7e7adad9c7aa58a4dfb8e23c39
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ffacb479db2a1c42e84a0d1ebf1565bc/konugiludu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3d24896851193754849c5c7d6ac135b4/mabomexavujurapenexe.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/s6sqiih9si78lmaoop5h248cc3/75720531150.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/navefijabides.pdf
    • http://bajajsports.com/userfiles/file/75362546188.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bad6be99d---runakenonu.pdf
    • http://moscow-vernisage.com/files/files/72983760054.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a540fb9b---99624562038.pdf
    • http://balogmihaly.hu/UserFiles/file/61184295196.pdf
    • https://fl-forever.com/upfiles/editor/files/kubesozojujunezeduzij.pdf
    • http://monkey-do.net/userfiles/file/83113986295.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/552afcb11ea3a5c5a59a0e4ae4e276cb/73300796296.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/35574035589.pdf
    • https://canionglobal.com/FCKeditor/file/19409951702.pdf
    • http://accessprecision.com/userfiles/file/73624595558.pdf
    • http://grandrosso.com/js/upload/files/88808755289.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/0a04130caf4361f97dc6164d285b7454/25037352807.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9a8a8947bd42b3d413d7b0f54fdbacc8/10688231428.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e50feacfd25299ece46bdbb8be132cfb/gowuxefaxulevasu.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/wedojatudegavuzopetesalud.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d661828c87e---87587795365.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd48b89abc7---18140851708.pdf
    • http://rogo-rotterdam.nl/files/xatojebixirefe.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/44173b934824e9b1928e60c09973bf13/90723641046.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=byproduct+of+photosynthesis
    • 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_off00011d38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
font_01_sfnt_off0001354f.bin
12c6c016563454e88b9c4f8e698e7af4ed333632252b8f2f344cc2e97667636a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354F 10776 bytes
font_02_sfnt_off00014e19.bin
aef7b3bdfd047b4143bb11b35c0cda24475e306b5c50b7c1919ae1d5bdbaf462
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 17128 bytes