Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2056563b1b5895…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 15:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adc304d9f42eca576ede70f5b34a4967 SHA-1: 5ffe5d543842de57c906971b679c18c35e0fefc3 SHA-256: fc2056563b1b5895093aaddd7a689180275bead9f5c41726fa1804741aa63e4d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the deceptive link farm. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • 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 http://www.leasebridge.com/CKUPimg/files/genovutonulagaze.pdf In PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17777050223.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c930588fdd---6235207374.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50844637200.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/xekubafagozinatitamo.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109031248082380.pdfIn PDF document text
    • http://computerdoki.hu/user/file/91428593843.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/3539832605.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/34269713440.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/36389167884.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210901004822947889nbaow2.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/susemeluro.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/54491783686.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/gozavug.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/21943939265.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/zorunafivededa.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nadojirufenelo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130206d54c6c---nugiroberasawawopedu.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/velokikipiwig.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630444385.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02b4d5069---46387743811.pdfIn PDF document text
    • http://dogable.de/userfiles/file/zaziveruvuragorareraze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=final+fantasy+iii+gba+romPDF 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://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_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 18164 bytes
SHA-256: 398aec026688374639f695e573afa4f16e983882060561fd4472a263cf7a75f2
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10656 bytes
SHA-256: 5bcd7fd84b113738a22381603f9a8bb0452ea3703e1b8be46f94d00f96f43dba
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1