Malicious PDF — malware analysis report

Static analysis result for SHA-256 127ef92808890147…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 03:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5df06af9fa8aff3d474564c7e8fe82e4 SHA-1: dc17c6bc951e325006e0cef54ef1e50f900a48ba SHA-256: 127ef92808890147656cfbc814be777f8724de048ecd9c006feaea84d89433ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, likely intended to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the heuristic findings pointing to a link farm strategy. No scripts were extracted, and the document body was unreadable, but the presence of numerous links to potentially compromised CMS upload directories is a strong indicator of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c0f1784e---ximorolubizajakekigasodan.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b341fac8c0c---14127231889.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523151719668553.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9412036d---9923756331.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/71a16e41be9d6dff3ab30321f598aff7/95147044437.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/988825187c302645e9914b259921bb86/56182363097.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a3ac745eaeaa62189be024418e364f6d/mazixegubev.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zadazadenubenokukava.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6ca7b049---texep.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/76191560518.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1245f7b158---wunopesebobetupoj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3oj80f9hq1e79rm8as5c2oobo0/bolewevipenadabukowu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pf1aq9u3mhcm46npmqdjbu9mob/ratudasapaxuzibemozulufun.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/13405702451.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a2cc1afc9f1f573921771b223ade3eaa/jizavodolulibavesuwu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8396d2ac---mulamigoganafetexizatol.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef3e86f96---56046167243.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/84343156253.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/jigadijidijujenememipotut.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcc1774314476fef512364c1fb65d2da/24350377393.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/96915005232.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af60b0b6d65---ligaxijanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=information+technology+and+administrative+managementPDF 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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 11056 bytes
SHA-256: 9521ce2597fd43b072f2c6a034aba75afc258247c98ce0b20f2e1916b692c8aa
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 15924 bytes
SHA-256: d4a88d4454b1f6234e7e1efde233f4eb2c48c44bc7bcd8c99d303c2c55cc88de
font_02_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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