Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2a7ddfc82b6456…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 21:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cde06f6bfe5cf189b428d910b98fc9f SHA-1: 3e8fc92239d900fec0ba16d49a541df89ebc8dd2 SHA-256: dc2a7ddfc82b6456c33418f24d7c3d7663a560f71a3bad555f1a6a44c8cf9217
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, and employs social engineering tactics by presenting a fake download button and a lure to install browser extensions or updates. While no scripts were directly extracted, the presence of multiple external links and the nature of the lures suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+open+mht+file+in+android+mobile PDF link annotation
    • http://ohxto.com/uploaded_files/userfiles/files/87337329340.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/nogimanuvobezob.pdfIn PDF document text
    • http://nprofit.hk/userfiles/kegidom.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ronorisigo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/46063529911.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/814dj4dnsfae2qcpp0lucfdgj3/91555126557.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/49453417723.pdfIn PDF document text
    • http://metallpress.info/files/88630883102.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210919_175225.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/24531054368.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbe214c1a7ee4dbcd08bdff557a5550e/55292413297.pdfIn PDF document text
    • http://baove24h.info/upload/files/lezuj.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/84523359961465f4c7ca86.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457dbc445d9---pomitaperavagatez.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jadafemu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fetupofumezazu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/romukeka.pdfIn PDF document text
    • https://best-label.com/upload/files/didogakuzirijefafobuxil.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/sulogusowaginep.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b93008fd968cc4f73d3be823b31d5cdc/87703765764.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141673885c89---89914207586.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10812 bytes
SHA-256: 9aad13cda8df43ca12e41aedf8eb5fe5a201bcd6afdde76500d004aa4042b60f
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 18680 bytes
SHA-256: b83877530696c201d8c90c84aef795a8e1a0b1b3b731a46110ce5051a3416c89

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