Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e63ecb9cb375141…

MALICIOUS

PDF

54.0 KB Created: 2021-09-09 04:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 749eca4b9405b6318a0ea6e88fe7dcda SHA-1: 7c47f51ba1b8d4a471d15970dfe432cfd9789216 SHA-256: 2e63ecb9cb375141e041e2dc5fb0d4c23aaba80dcf959ba0d1410ee4f3659c77
154 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, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8114

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=leap+day+mod+apk PDF link annotation
    • http://guides2alpes.fr/uploads/file/96007675761.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/31139238282.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kuvapawokuruva.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7acc3265f---83695552948.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/relimuruluvopak.pdfIn PDF document text
    • http://sbcnepal.com/images/file/putidujoditofatawo.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zepomulupasunaxi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326279c0695---damerij.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7412ad163920b17597af2eda0e3a0160/84620020277.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/puwakojubomirasa.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/wunivod.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/4275175864.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/musuba.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/57806759113.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nowalepopujal.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/66454158130.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xofasimewuvosawusom.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/62454875369.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/ritelepu.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/gosino.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/47629399614.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/93296168568.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/niparevakijupimizus.pdfIn PDF document text
    • 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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 10108 bytes
SHA-256: c998188076cd912e472c769aee964505f99688a9d01872f32e29d048a949c897

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