Malicious PDF — malware analysis report

Static analysis result for SHA-256 115de21cab5502d6…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 01:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc11013fb968c9d544a8e50ac2578867 SHA-1: a60b0c2ab5a6c1e1b6c021e687d0b8baace818db SHA-256: 115de21cab5502d644f6754cfbf2f544da1a4705492254f12100d742db1d88c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination or to leverage compromised infrastructure for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2ccc882d723a2e7bb8873b313d447cda/simoruzerajugilupas.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/75002017619.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9rpkb7ashqgda9g4hkqe0fuo80/kogefidever.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec880cd0e4---17557074312.pdf
    • http://allamericannursing.com/userfiles/file/jekavobivedod.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/simoli.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb95f376a---gasarubipuwugomoborotagik.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbe398d6f---labonor.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/7b98cd4142d9ebb0acfe95eacfddeb94/jerisinajimozikilobudox.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/63h4qb9is50ssvpq61ho238r40/50281473352.pdf
    • http://kcde.kr/userfiles/file/xutox.pdf
    • http://aylincinarli.com/fckfiles/file/muwosenobesiwazuwoxulo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5tcbvbqh4c6l0ga9as77d0ra5g/jenemaseros.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6b35a5e6c812ae405458e3a4d47b0b03/76024853159.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/valifafanetisix.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792ca59402b---17671004984.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/32b76603bbfd5e99ebfeda6321949d32/wilasujatelokujazinem.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/48390103079.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jlni05gm8mkfqrh0625lb4vj52/linokevufudoxuwudovizuf.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gg8ibmfes5us327n9j9j2atkg3/10612046435.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/271efea690646e33fc6820934b3e2e1c/35148803997.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/22qd007c5dpjodd2lu1dbr0lo4/34633962842.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019e0bd330---powegixaboxaxijobosol.pdf
    • https://karinbentum.nl/uploads/file/pazibizifixorijufuxojabo.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/l0fqv226asj3spjhosv2nenkl9/livamukuvoz.pdf
    • http://gpszone.hu/upload/userfiles/file/34153450629.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=business+analyst+self+appraisal+examples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe4.bin
0f0dd8cff33dabf3b2653febfa38091b592b9f548552fceb7570f19cb3b2182e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 10768 bytes
font_01_sfnt_off000114bb.bin
aca79903ab992a53be1db6d5a01bfe4ad97d375ed38cd60b36d559ad2bcffd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 17252 bytes
font_02_sfnt_off0001418c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1418C 16792 bytes