Malicious PDF — malware analysis report

Static analysis result for SHA-256 17856e9c45f5998f…

MALICIOUS

PDF

115.4 KB Created: 2021-09-03 17:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d6c492ed68e8da77215eff675b81a9d SHA-1: 1e362b9547fb9d5519109c8977bc57e6a89bdca7 SHA-256: 17856e9c45f5998f120ccb45cb8a08faf74cd5418c03d62bfb8dc3cca5be7546
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, specifically a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to malicious or compromised content through these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3908

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://xosobacninh.vn/webroot/img/files/jujivenibemu.pdf In PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/sebobigavif.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/89864362014.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/99456815769.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jojufiwaxezekogede.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/zujazawuvujewapekixaseveb.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/29533355715.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/15f459ea9593140b83305b6dc57bfbe0/55171684464.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f831484a7a---13771594765.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/powubemufogon.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/48967341895.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/k9t1nipm10metuvsdt9vnpeqb4/gidefawi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c12bd3f90---xemotezotivetizu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16119628d03468---guruvugifor.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3eb06ed781b06965a609cbd7c0005cfd/10652457690.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12050055390.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160876d525eca5---68811660358.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210804122921.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/tigiguxeguxiliko.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/paluzazebadedalisujizaja.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/8d87992bc816dbb6bf6fc0320d3ef72f/53728890229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=digital+signal+processing+fundamentals+and+applications+li+tan+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/28654718e6cd9aaa3966fcd813c799df/feduf.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_off00017073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17073 11064 bytes
SHA-256: 796a57143affbafc649de5d103d0c0c302572caa90065e6ea1d13a9643dd52ae
font_01_sfnt_off00018a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A01 18892 bytes
SHA-256: 859e6ed30549320ba48b91a3af879fcebe2b5e7b0a44170d17c101d166ff6b08

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