Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b643242a556112…

MALICIOUS

PDF

69.9 KB Created: 2021-10-08 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28d016846088b4b974a374870f020232 SHA-1: 9f743138447f4780e4c4213c8a711c06338a109f SHA-256: c1b643242a5561127ccb34f6e7b78176ac62a56b40f491e8062b10535d924674
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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://samtle.net/ckupload/files/pupasozazakimer.pdf In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/28505064315.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/15652120375.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/uqv0qp4b89c311fc8ocsntsfva/89145939234.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/86062327210.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/33d0d1154029b6054488dda2a96c7a62/xidotusumugememebona.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/24071091448.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159a7ac84015---livavelolix.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/87898778549.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_CB7E1BA3DD101605.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/konikuwese.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/75133978740.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149ce151ba0e---gafebo.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/78452274779.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/13114638888.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202110032022436098.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/josobilujen.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/pipidolarewemapesemar.pdfIn PDF document text
    • http://kco.su/userfiles/file/91515146270.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3fc2e20e---sigexa.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/gixojofajavapomezabelifa.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/79929194318.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/64363423804.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/13376297657.pdfIn PDF document text
    • https://norservis.cz/files/files/vuxivavefizifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=map+minecraft+texture+packPDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16092 bytes
SHA-256: 21737af2c7941341013c648bf972f3e679b4e9ea009c10f618a7327de784f0e0
font_01_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 10596 bytes
SHA-256: e4fa45f24c4dcf6152963f0ec7e12ce678db117691fd5d5ca52bb52e3802aab7
font_02_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1