Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fde945e2bbc6f5…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 21:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d9ccea3f25869daf4364664180d5a56 SHA-1: 7cc02ad548e9cd6753215688ee0d5682478449c7 SHA-256: 91fde945e2bbc6f5587236169888b55ce141972d60ee5bc1ba4d25f50df67c0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tizofepep.pdf In PDF document text
    • http://championshipsportsrings.com/clients/23492/File/40166206728.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/jasoneresutovejomojek.pdfIn PDF document text
    • https://tonitomov.com/picture/file/zabodifafexatikemuvurov.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/miwiwotefu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1fb6b858---47898379476.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pomafasotikixabovomimav.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e205ebb---dumadefivefe.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc07bf3f813---zibukixilatasaxezonorogo.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/82860170916.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cca4679e2e44a64f2a15a8051ed2ac3c/85230836634.pdfIn PDF document text
    • http://merwepizza.com/upload/file/54669720745.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08d96b1e6---bazabagoxav.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/47674603306.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58100e76---lemakunip.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/dizezodopejepawogurunot.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f84b9dc9---95473964917.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0e5aee6ab10f1c0fbf6d7f4ff426e797/540676388.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/83413402878.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f749a893e3ac52fb2320d8380e2a6b7d/83650438954.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4b4e621cb16dcd49dabd20a6ddfc6eb1/jibofeluwezak.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce2624cf9---kuposovu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c938befdb---45548829534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+play+spelunky+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 18180 bytes
SHA-256: e093d97d872e5d7ef73071da790b276573666afd252871c18062de3925e62968
font_01_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 10556 bytes
SHA-256: d3378fdd9faff3c6541b706d727cb5543c054a299e284858ed177002269cc692