Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbf369ae4cfbd7c…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 20:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1812b207407cff68ccf7461ebd232a54 SHA-1: 27d5a31d732f0705f4e67a98ff56296fa956834b SHA-256: 6dbf369ae4cfbd7cb21f8ea760974b39d8c10fe68231ddcffb9bd2ff9ed0ca53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8850

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 https://medvor.ru/uplcv?utm_term=demonstrative+pronouns+worksheet+with+answers PDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/kusej.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/rekubikejigukuke.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614313a91e16b---71393564354.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/42193112959.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/vametufazipiwanadevibiti.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b00836cb8d7dcb0c73811269fb32238e/36935435362.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/megapofoxisodemuledosite.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/kitex.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/49103737182.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rimodel.pdfIn PDF document text
    • http://muszempilla.com/files/file/neleworamudimozefo.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/ziwebida.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/3559651227.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kdj03jc6j3k0jq2kupnrabcsi4/niwibijijar.pdfIn PDF document text
    • http://labradory.pl/file/26882540619.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59378726042.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/29127044115.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/sirozuwunavi.pdfIn PDF document text
    • https://endobible.com/userfiles/file/mejofovug.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210924210034_jcdg4v.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/zisexoruxumufovukosumot.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/18002010710.pdfIn PDF document text
    • https://businesslife.com/content/file/47054394971.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/juvotadu.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/39381572668.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 10816 bytes
SHA-256: 04db9261fe4f6341ea5d6fdf637d84285f8fc9d809b02eb53bd7672fec994e78
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 20000 bytes
SHA-256: 7a8355fb4d6fd81050462dc6ec580a41de4cbec178dcde9218651fd86f3a7417