Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d08c92f2402edd…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f33bad9a4e67a4a6fa398e28d3c452d SHA-1: 045fb6829508f8d70bebde7f9f900342cf204bea SHA-256: 36d08c92f2402edd6a62346f747d0e02f5a18712cefb19673509a349f74ad8a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=the+whole+get+up PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/50c97bf48f97804824fb27dcbe715cd8/xoxaselevo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/39911547409.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16218554239191.pdfIn PDF document text
    • http://flexa.cz/docs/file/90605513329.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/13951079849.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/94857975821.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/11142839348.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/62479647099.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/afc588e662d1d6d71ea6badaa4d9416e/guvitizadipiwazakiz.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608691c1cd6cd---85679360645.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/563a78970c946b998712b81115cfae05/50326854356.pdfIn PDF document text
    • http://akssert.com/userfiles/files/84177058243.pdfIn PDF document text
    • https://laser123.com/geektic/files/25525614241.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/59862634599.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/38960802296.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b5ed34ca---xifewukokaxuniz.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/judobozamapilosoxisu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/migofoxitibarorutu.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/jalumubet.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75ce8252916ff6dbe57cb40b92baae88/mibaxipenilewilupi.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/42902009807.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c769505449d8d4b8ad6dbba6582ea9c9/73402716789.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3lu7af50k04u75uq2s4sv93hm1/44488405867.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89972b111---jogaxenipe.pdfIn PDF document text
    • 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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17296 bytes
SHA-256: 511a673362b6c551f646968f9610dc70ff7b364585be1df69b3247ddbd614f06
font_01_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 10056 bytes
SHA-256: 10df6b76ac57109ba553c3e4537baa949887638e595ad4e7d765ff33f92c06e2

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