Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c81e7eb3a345a2…

MALICIOUS

PDF

73.4 KB Created: 2021-06-27 23:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1d092a5ba4e58d2ce63555b98951276 SHA-1: 85cc258caa079119b000a6f9d37aefaf6ce0650e SHA-256: b8c81e7eb3a345a24ba2684943d708bb81e5030b127ad0ffe9e18a0147008ca5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted domains. The primary purpose appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781ef1a6073---91441051262.pdf In PDF document text
    • https://wrd13.com/force/file/jizugowutemitak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88e47713---7962846090.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/5676862877.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/bonemimodimawanupitubari.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/99999829353.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3692b66d6f---41590983437.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zafemaludeto.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bb2a76kdnj3u5tfffe5rckt5qd/nerepelalegiwuwesosavasap.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/46027192434.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefanoravekiriwuxoxovija.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/muvowevon.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d8468576---lobakub.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3fe15036---81529153207.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/54654250109.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d81b86db2---pesuzu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8fe8f32c---madukaxawumogava.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/74504826800.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jubobulimamozigig.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/75548840736.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74de54e7a---775639527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=out+of+office+message+vacation+examplesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 18444 bytes
SHA-256: 25b2f0532f69a1bc958b0deaca3ce2a0d4043edf08a2d1f7a84179819dc086a1

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