Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3022eade2e1609e…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 08:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36b74c1b13bf658b02f5dca1dea24949 SHA-1: 0a93ffb1306c1eb22530b4dbec07a2e0114d0955 SHA-256: b3022eade2e1609ed112108eed8443c7d8b2708f9efcdd727b60573b6ee759a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://rmduncanrealty.com/userfiles/files/59555024882.pdf In PDF document text
    • https://cuatudongsaigon.vn/uploads/files/54621811023.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/vusob.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20211003_E6DB0969C45A5764.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210917000745.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/lewamutax.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/22010100066.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ea96f7d1---bikaranibum.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/61066030585.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/10955996948.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-19/20210919190528382520.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/ladoxawoxoviretokajoze.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/xefeb.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/98507898025.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/50456987535.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615702fe2c4ae---64036009708.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vkiniknmqor6uf92mujrdqfg92/puzitugeramuwerox.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa9d39a986---jolasonuxigax.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210927/file/wijavogujetakumemozikav.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161433ee716cf7---86482021846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=marion+federal+penitentiaryPDF 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_off0000abfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFE 10428 bytes
SHA-256: 3393e53d685c769927e45a55285af5ec15334a436eedf1a5337de0dd75a73e55
font_01_sfnt_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 15920 bytes
SHA-256: a8a4df9279dffff33fbf3e699ff4bbaf3fe234869142accc119609a670b8f0ca