Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dc61fa5f1da099…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 05:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7df61509ce22c69357cc8a0c3ff591ca SHA-1: eb26ce2c3d2dec8496bfd5d6aeb55aabfe99bd58 SHA-256: 09dc61fa5f1da0994b4df71601d45388ff5bc54758ae5fcb3d35aa9772e4338c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pixomot.ru/uplcv?utm_term=sample+letter+of+appreciation+for+financial+support+pdf PDF link annotation
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/60901229137.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad25eb0e46---wuranelawek.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/96307097008.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608125bdda935---pejagivaza.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/wepimilenixixirumufap.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xefimemofofuta.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/65973442030.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af343543373---sinuwolalidivumabizovi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106301914142298.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/gapirijozix.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/97832142564.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5f7dc4a3---68596859370.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kvpr7rh88rbrksi6d4fdjv0o89/vivexokovofevama.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bd60e3fa41937a4301fda790fe666507/7678416726.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/mifofawabigiledodedigike.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12782255585.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d4995ed44daa351262f23ec0bb14ef10/23417329871.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/dudolamoki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074761f56c99---gadovoripexelifuti.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802cb9f37b3---pefunoziwusilusedawabi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd3a434fe---99023528757.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/5316815870.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/vusatupa.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xunomujaliv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012e39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E39 18532 bytes
SHA-256: fdd824f56c9127b4aafbffd1b023eb100a7c7ca6c2d549fefa0def900cfc8ec9
font_00_sfnt_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 10956 bytes
SHA-256: 15186faeb04ed0bab9a3e9d99ac57d6ed37f3bf7bf2c480c27783c6eac8c2013
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 17280 bytes
SHA-256: a3d7f68fe801f26861410915e3c562c5ead8c1712ddc4f06e20bf82db5f218eb
font_02_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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