Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1f4109e5ac6dac…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 17:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 425a05419b9f9adffeb66c10c7131293 SHA-1: a8993a9b1368b8bb71605fc29af015eaeacc774e SHA-256: 3b1f4109e5ac6dacab4e02f4a619cc6548ca6eacd771fdfbc63f51581858b566
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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 http://ssp.by/var/upload/taputafumow.pdf In PDF document text
    • https://resulgame.com/calisma2/files/uploads/zororowotasalo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f170a73758---58570657118.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/974422552.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/75823522368.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d958a5794---6188061081.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/rapagogelufedapore.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/9687119157.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/aa9fb6ea707c7119cf98d7b038c6c98b/dovemagesekirozoveniba.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/gesosadetego.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f581ff51---44229364035.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/71611973199.pdfIn PDF document text
    • https://goldenapp.net/file/melipimoxewilodeg.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15668652511.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610518f7f0d1c---wagefafajiruxizevobunetin.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee94bc948f---najuzanajikumegi.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/laxoxajirakumirafaro.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/16968903552.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vuvuburug.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/09686db8df524cf72172b31c857c6160/95556957686.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210626/file/16246644804389.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/guwowu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e373e5b7b---sororemidadejazuke.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/gq4girfb952voa8kk2vn92lbcf/9695283502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=low+technology+assistive+devicesPDF 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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10772 bytes
SHA-256: 6cdfd192c26556ab6d2bed49e45a58210d8e95c8055368cca33a85d9ef09df02
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 17364 bytes
SHA-256: c991abf8963b92f116b33587586602b758d87651a3c03fac555c07b1cb08740f
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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