Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb4410b73f0ec38…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 00:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c1b6a3cc1ae17e659a0953d40564212 SHA-1: cf10ecb0add8b7c7d4f1c7e4bdf89de0fdc75c01 SHA-256: 3bb4410b73f0ec382dba20d8a5c63be4017aca5c83c8a17a9a1cd6e863d5ff37
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic indicate a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://kashima.cc/userfiles/file/98448794297.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720db1bd7a0---kapos.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/47607702012.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/voxapuwixubirodebidodek.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/eqd9lo7hb2b2cgnrtkmbl6a79h/lilevadudosimi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8e3545fd---18325346168.pdfIn PDF document text
    • http://quaint-house.com/todafe.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sk7igeakbsqhao5ib60u21k863/80537505103.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/49290698853.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/9849119285.pdfIn PDF document text
    • http://aven.su/userfiles/file/mimafurame.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/75562845955.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dikuge.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/xapivinowow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kgeof5jjj19jnv0r6ng34lct5/zigiripimemoje.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/go5kd9vekge3o5f7jk4etmqot0/jefov.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/sobenejusijumidefu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tipaparodomagemamesa.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/41848986865.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/mevotijakuzafa.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/vovofafabelaxibijo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbfd0d1f2---wepapilamazuxikivetafi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/acc1083ac6df76fc954dd453c77bd216/suwut.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/44481768991.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44bd270b36---gonijetopefezogekame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=red+cross+cpr+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5886cfa453c9aa602b9c9d9da79d9de0/rodazufuzilebenejiwul.pdfIn PDF document text
    • 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 20140 bytes
SHA-256: b96f217057003754dd40ee342d37070402f7adae19b5d046fb0c92199ae0356e
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 10628 bytes
SHA-256: f33626fe5c048367f26b635037531a00b7e2cbc80d4f5e975f500d56b433aa1c

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