Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd117c7f89427ac…

MALICIOUS

PDF

77.5 KB Created: 2021-06-26 09:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b4f439f668717dfc31ea78df61bb8bf SHA-1: c3b7a1d15a8fa4c8e0ef7bfebece28ac2db07603 SHA-256: cfd117c7f89427ac820b6f87cbef2f2c885a33188773eb4b3d4db1280a7f6f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple compromised websites hosted on CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d47165c8b06bc5f2cb69973eb737a9ac/21652590682.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b59046cb0---72062056778.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/fogazumopanidaketi.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/25b8c993d4fb690fdb2985620d9494ba/88038341344.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95d55881621fc9a50f8793d508f53726/50147440709.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7243dda83b17f282a89f9675371364b8/deriguxojopebuze.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/077638ee7197c2de59dff9589f56416d/koduwobotojobosumumodet.pdf
    • https://euroroma-bg.org/files/file/vexuminodozigig.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bdl3egsdl6kbtfjtk72v7infnb/pebuxil.pdf
    • http://zulaikhatextile.com/userfiles/files/saxuva.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16211810221791.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092abf65c65a---garofi.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5897837c820a6d96f6b25c18d2bc73ea/8544255788.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210604_060247.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f8f5200de9ae8751a2a6934271f219b6/zaxig.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8084155435---34611580841.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ac3ea36a---4683841190.pdf
    • http://dianacb.cz/userfiles/file/3225201104.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5d5bggbdrtfd8km16ern7m6dd6/wiverapakejaruxepesire.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/cd4ca649575a33d9c2da1c6a7d3d58d9/86167807422.pdf
    • http://ahcxdq.com/uploads/file/300745093940.pdf
    • http://jhdjt.com/images/upload/File/zetojuxozisirisawatomik.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098325e0e1a5---31198824801.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=words+that+start+with+coc
    • 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_off0000cc3a.bin
1cd782b0890a02d00040b97f2431e58e9deb0d825246925f1f7e6abc4447398f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 17508 bytes
font_01_sfnt_off0000f9ab.bin
7a44b4ebda6c962fb02090737e5e1948afa582ca41628c931b085641777963a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10264 bytes
font_02_sfnt_off000110f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16792 bytes