Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f93e70486744e8e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 03:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a087f3a7a28bc892dbd65aad9b60ea46 SHA-1: 3d450421ba1f6a4f5d22b320cdf14dff0795b241 SHA-256: 6f93e70486744e8e7decb46eee19cff877ad710c7b56d3dec1e1c497bde87f56
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f57f68fa2209e94f2df9e09f21cf09b4/lopetexe.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fbb71fd3f5fb7f2c3db4970246e09fb8/42876204371.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4918369b---guvizogisolunewi.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/11133189583.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/8098800254.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/7714951832.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///nekebofepivudidu.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/13830390234.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c9daecf8---xamenutilafedorisijosito.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161048f33d6623---foneda.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/dovibimilefugimewojixewol.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a4s3t8ihj464i196dc1v659c8t/24175717310.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zofanugaserir.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10636c2c---pizugimun.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f53b7ac4e---18341215239.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q0tfjtfmlf8abcd8ahmpujpq02/vizizemiguxabumudux.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/zepulufuvimif.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/77026345866.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/dufonutogonekeg.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81208eac1---sitavewagokenalil.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/nelusisalimuti.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/nifeloli.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ugcc0k90pi7fjaso4s4tsdkq64/fixamogufofoz.pdfIn PDF document text
    • http://jarosi.hu/files/file/zevadebofifofezo.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/13851386300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+maturity+in+englishPDF link annotation
    • 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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10868 bytes
SHA-256: 723eab2a25b69c519cc4935abb5c8858e12431f54afe554ef49f3bd101649981
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17168 bytes
SHA-256: 73541f9e9a31e8aa47c7d3528dcef7bb74389eb33c5214339108fa6bc9df5c23
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1