Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1620be4a0e4f45a…

MALICIOUS

PDF

103.4 KB Created: 2021-06-25 23:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ff9a6f1ac7b71bd3cb600c72986b870 SHA-1: 6e08b2796eda3b69d9bdcce98bd38d73881a94d1 SHA-256: e1620be4a0e4f45a0e5b0dc72d96017a9e60da6eef48344d339d9c66d9aca358
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a deliberate attempt to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://coretry.ru/uplcv?utm_term=one+ui+icon+pack+apk
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03dbc8c96---zadinetidoxobowewu.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9963a8dd9---fawekomuw.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/225cb0ba083d2f47b98499fc0bf82994/farupemex.pdf
    • http://paillasse.hu/userfiles/file/22988567474.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/05e9ebdd285ce4d01cfd6ff61e6d8566/belupo.pdf
    • https://bimstudioinc.com/media/files/60973534589.pdf
    • http://eksan-ltd.com/userfiles/file/45884278790.pdf
    • http://beiks.info/public/file/29674224690.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/17a66f78d1dba9c286c2393e3b9899c6/50331749649.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3cac4dd2---42085788459.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f8ac92c5---19511415489.pdf
    • http://visit-pune.com/userfiles/file/sekowovilijopaxima.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s2snhsccj3oi24eseh8d5l2rls/20350451755.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37785e8f68---wufadigu.pdf
    • http://whalesart.com/uploadfile/file///2021053010474914.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607636bd2a3e6---kinotep.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7745a979---mofotajikixodatosev.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c44afe8542e---40465008746.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/kegugodutifas.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8273fc9f3d---vivenutorifizexawepaxul.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7a74f23b9c420f149ea2dc2c5f7786be/purila.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45307fbd0---35462451902.pdf
    • http://accronline.com/userfiles/file/28679643538.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b73c0c5e---19477176224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001261f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 16792 bytes
font_01_sfnt_off00013e36.bin
0accb4220a78a9c78adf1fba541172de1442ef6398a3c6a9b038e63dc2af4d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 10172 bytes
font_02_sfnt_off0001551e.bin
45aa91ea608f1a9e0e13e404ec0cd571b1346d74d3ded88f372747d814581615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1551E 28836 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.