Malicious PDF — malware analysis report

Static analysis result for SHA-256 f982558d27a84ede…

MALICIOUS

PDF

75.3 KB Created: 2021-09-11 11:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5bcb1b76e9d6bfe25c44c5342b67948 SHA-1: 90933f9966810e8c8177e1253dd88d58f488b420 SHA-256: f982558d27a84edef0aca857f1b98960e5189bbc9673111db8f560658e9fef9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains embedded JavaScript and a link farm pointing to external URLs, some hosted on compromised WordPress sites. These elements suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=flappy+golf+2+android PDF link annotation
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0d8683cb22b9693143c0f05819573a66/kilibiluzabeki.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/voneramuramekemegonuwov.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkrfjpd4o1qp7rehq6s1kt3ujv/21717378718.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/mujakewota.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zotoganivuvapuf.pdfIn PDF document text
    • https://songhongresort.com/img/files/xikaxo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/73772433487.pdfIn PDF document text
    • http://boldogelet.hu/media/28846935640.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/nasak.pdfIn PDF document text
    • http://klemanpince.hu/files/file/watol.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/zupozupasaluwaxeriz.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/34266600960.pdfIn PDF document text
    • http://afslab.asia/upload/files/tofutixigafipexo.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72720488553.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/bebakegobuxisodi.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/kujak.pdfIn PDF document text
    • http://wohingltd.com/userfiles/gefiledasejevasamituw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lqu6u05f2shq9ert78dmn7am96/bodowobumiwevos.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/pilaxedivarijevot.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/67392761822.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/lemimozizojunezid.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/14894050527.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/serojuvibedusapasebiw.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97138518031.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/lovob.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 16796 bytes
SHA-256: ee53db82dd5740029661f6232a1340568f53deca4230014993864f3090192eb9
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10484 bytes
SHA-256: fc914c6a3bf66f2e4dbeab66a980e496c3ec19206679c90b74576cc75e77ed52
font_02_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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