Malicious PDF — malware analysis report

Static analysis result for SHA-256 484fbe9570da44e9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 00:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 294ff1ed4c1b0e3effdac5c344ba7ad5 SHA-1: 3571d23a7a497d3a451dedf0711549a3b7fb99c5 SHA-256: 484fbe9570da44e9b9b114a8693e3596c82193e5f35ef082ab37c0c3c1ed02eb
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a high-risk heuristic indicating it instructs the user to disable security software, a common tactic to facilitate further malicious activity. Numerous URLs were extracted, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://a-kamen.com/userfiles/file/13691598460.pdf In PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/bomimibukavutujexokukiv.pdfIn PDF document text
    • http://tochuchoinghi.org/files/wepetezubemupilegiwile.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5a5895ed2d4d7d3557711e39936fc6b8/latexexogemeko.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sixitilesof.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0tpbg9bk3md7s7t8ls7sbjnj2c/kelovafe.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e342cf4d819a49db35977bb1d8451a2e/wutopo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19d212c4c12565ea751d2605c04c802b/tomonuf.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/41890099554.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b1c9272e---92632501807.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bab34fcc254---88286206293.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/12830930998.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d78c11c9f40f1b1c4ad2c66d472e8a55/ziselulorutetenowataraj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f14abfcaaef6fadf8280d761a5dc7a25/53980669201.pdfIn PDF document text
    • http://nensi.si/upload/file/fozovidab.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ba28c0d4---buzaluzezimojonalok.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/rutaguxokukovijo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ed97ddb0d---wujojidimakokolewodi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f3a45b7e3e18b3c0d5c5bc3918026f17/28085917192.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f86f74c9a---93987597650.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/fezuwewasagowijafo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/184b4ea291c0f9faeb116418692871c7/tumemoxipemiku.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nrm1num3jigmncedcnrqae62m1/10080038463.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/48123403117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+wallhacks+on+warzone+ps4PDF 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 19760 bytes
SHA-256: 6f0d1794faa1da4d204e3b354cce6843d95a269348d9a61f15508aa971141c64
font_01_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 10868 bytes
SHA-256: ab9a5bbfe907951f3f48431be4f0beab5a77c23d90bc77f831a290b5d7f5f421
font_02_sfnt_off00013edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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