Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a4371e85da619e…

MALICIOUS

PDF

71.9 KB Created: 2021-05-18 04:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba31a34e9d9e53d0e54fef70c1891b5f SHA-1: 5b035ff7b0d55b67e42aa78f8361a6d192562669 SHA-256: 36a4371e85da619e85cbe29c3dd7e8865e7a1020d76fc8373a5549fa62935bcb
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 functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7687

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://cructi.ru/uplcv?utm_term=pinkfong+baby+shark+free+download
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ctaohse5nh4iepooshgmd9l5t2/fagig.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/bim4vshuppacgpchlqepsi9hgc/kurunopiku.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dheeoq7m1632cgo1vnb4gp9r20/39014193131.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2461dcbcd---45939451191.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec54a317---85331956206.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e290724f08ec2b7500e5d6c0aec62977/55309686043.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4bdf61cdb64978dea94df96ebe803c84/48881206080.pdf
    • http://billsky.ee/files/file/78622769401.pdf
    • https://tecnicadovolante.com/images/file/nifafu.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v9qnnegd0drqsg4rb0691rjom0/padojotigesekaz.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/36b16a1a184db797478a7f69eee566e2/10439074776.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/274dfe03d2d4e6aa5c73c9a3e50f0271/52982434731.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cd866421c31bf8dadcd447fbe5fe273d/36283087688.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4d098c347b7327ee4f8f3193ff27bbef/8041746509.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b567261a207b63ef571710f652c7c265/zofuxuvajapifesetat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db31.bin
416ded5d63a9716b745a58439dbd1e6d8ffad655a6b6b782b0758ae382e94cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 5568 bytes
font_01_sfnt_off0000ee30.bin
bafcfd1afab53a3f4678d1246fd71a846553f840a222806fad580a24350d2e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 1892 bytes
font_02_sfnt_off0000f74e.bin
90c978f4e840269f44f01437e0cc9399a5dc91eb922ea96d2e905f5e7712896b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 12264 bytes

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