Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbd209abe79527c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 11:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5333534d4829547ddeb9b01fd4f60869 SHA-1: 0054f74a0526172b80ad88d92b6f3c6b05ec30cf SHA-256: 0cbd209abe79527cd28484505608fe3c3e84adf233278b0d1588b633b345f96b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to lure users to malicious sites. No scripts were extracted, but the presence of numerous unknown URLs indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rvcugmqruull6td9dgo5c2hg0d/4007350665.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/ridanumuloweliveto.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/kuxokefofo.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/42271839443.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/56161696036.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d571afd85---newalupatizojuzubasibufo.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/36220412726.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/20112214724.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8a368fa65e72b9a62a9b9cc1fea3322/26261397927.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/dakixosumibaz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f9ded9a2e---21500689576.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/48899300353.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210701214142.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af999d19aeb---97634216985.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dufamomavegenepodo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/zoxelexefifuruzaxa.pdfIn PDF document text
    • http://terrietanaka.com/library/files/30775343647.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/3541174098.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043e2a1c387---lavipik.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/37556944131.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssk4k3aol0hh5jc97ffsfvbeq4/bigarobijosarikikerigepo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872ef28821f---6320147723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=b+cell+immunologyPDF 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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10312 bytes
SHA-256: 411dd0603ddfb9374a34e07b8fd8f728453832885e04210c346ee0839142f08a
font_01_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 17848 bytes
SHA-256: 0aa75b32db85b8d4b5665c3cbc5fc363bdc9f40b4ab4da58d86e87040927411f