Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd65e924275a052…

MALICIOUS

PDF

95.7 KB Created: 2021-06-28 08:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36c666098d21e38382d9e312a3922d75 SHA-1: 80db606a5dca31d187d2bb220db11d5a3b5f0023 SHA-256: 5fd65e924275a052afed58845899072b4013fbc6161316594f3b4216fe812c89
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6lnn79hafet0d803npkgcufali/22229814731.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa6729b7b04fa591a4059c6a933563a6/witubafobosow.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/do35vbkgfaklnfibn8h68jhgev/17232521707.pdf
    • http://www.deopendeur.org/imgUser/file/65270454277.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b456d18---67830194069.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210507125529_626260794.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de53c918cc---zidibaxitafibuditupuluse.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bc83ca75---91514161983.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/13048929905.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/92e58b6588e03ce8c8c3328ac00d62b7/wunopepozop.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160820af8092c0---nivipu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d3c6322e---dinofavokawudusape.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/30168585359.pdf
    • http://adveotec.com/img/file/pewukipigevidum.pdf
    • http://app8itebarandgrill.com/admin/images/file/47865346426.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210607_EFD09F1087E83BFE.pdf
    • https://badrivishal.com/media/92853645850.pdf
    • http://generaltubi.com/container/ckfiles/files/37459001016.pdf
    • https://senhewood.com/d/files/9793486394.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a743003d16f---robatorasisonokujenifofep.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa950a95931---tomegijukoge.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210628_34B8DB69654AA1E3.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8c2c8f9345b8e7fbc4b7a5b73ee0e549/76990541570.pdf
    • http://biotledlight.com/userfiles/file///68123126737.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/551cf9597a7de589ca0ff1caafd3d470/mabamoxojapotilatanej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=happy+birthday+future+father+in+law
    • 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_off00011671.bin
91db249f30451ac83fc19a862244cd36735f0353bc943f77595f314e7d6b8e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 10740 bytes
font_01_sfnt_off00012ed4.bin
3ee5c6ae25d9d4270ad785a1e554144400fb6e7038eea06d8b3db4461497100e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16568 bytes
font_02_sfnt_off00015985.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 16792 bytes