Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c07497c8d91107…

MALICIOUS

PDF

64.2 KB Created: 2021-09-19 12:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 144f469b96c2c05ea2063e889774d15e SHA-1: 83063a2c5f1947bb2e2612a81ef23c6320a66476 SHA-256: c3c07497c8d911076392d8a98ccb9b1dddc278d4250aeb22d91ab2624f4f35bc
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8256

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://ydchem.cn/filespath/files/20210916115540.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde8ad9c2---mokawupumidufer.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/sepunafowuraxekageto.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/sorobixebig.pdfIn PDF document text
    • http://tianfonmm.com/d/files/27948069107.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161444ac11092c---gigokoxomezodub.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/8208487993.pdfIn PDF document text
    • https://poker-fire.de/file/kamovadogalukaki.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/8768244427.pdfIn PDF document text
    • http://gestioniarmatoriali.it/tumuter.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/48722279145.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/faxizirazapir.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/15295101933.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4269d371fed255b92de938dcb3d228dc/1317703993.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lifisipevinusufogogegolel.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/paxojido.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/64288410990.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/23664151085.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/sagevetowumoju.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/78878280212.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/30424356117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bully+mobile+apkPDF 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_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 16992 bytes
SHA-256: 897d58ff901aec32b78d0a2acab7a614db8894921f02865412258691a965e393

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