Malicious PDF — malware analysis report

Static analysis result for SHA-256 10762ecc9a9db755…

MALICIOUS

PDF

70.3 KB Created: 2021-07-22 05:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8551e918fbf3d8a6719de6531cf59ddc SHA-1: f85e6756e5d62c6e2e016797a08342484e4607a7 SHA-256: 10762ecc9a9db755eb808b1a3c4d4632cfb935e3d8d16ab2d07bb96f5e598366
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to redirect users to phishing or malware distribution sites, making the initial PDF a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9641

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc33ca340---pukoxizetetupom.pdf In PDF document text
    • https://inncredel.com/uploads/85562700101.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b9b14074bd66663ab9b9fcb4a1102b7c/bemagij.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c6eb237050010731d6d1042276e91971/wunexake.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6mkmuvo2thgd2i3ev4v6bag2nv/texirujinusapupasoj.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34fd730d41---gakobinosapefub.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3e631252---61996997642.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/nojeguda.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/kilegu.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/39169023460.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2u6orv1onqccsa6g9gbaha10n2/16807222840.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/94835350531.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/afb4763b91f8906f5b6064a1ddffe66f/90786455284.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/26964581135.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae937bc25c---21914882455.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683594fe44---30256818690.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde7fe8cf3---mavulefagiliwiribig.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/48be26e11aeb3cfc256b13afef6852c6/joboweka.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c19a3ab0bd251fc79c93b213236b7749/18486514356.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607701afdf979---retigos.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4ce70e24---soganorotofavuzazapa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160959a63e4692---95298955872.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f96098e---59544786317.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rorimiv.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/95623249551.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abf07caed4b---simupepejopaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quotes+about+self+centered+familyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11048 bytes
SHA-256: c93d3d6b04d92493e79e6830938a7d5a8b739bcd395533f61c3366d285c89d72