Malicious PDF — malware analysis report

Static analysis result for SHA-256 be27d1724f57867a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 21:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a5a70fc0509cec669f8f137594dd4ea SHA-1: 5fa9fcf3d309f2a2dc50fe581e08e4be82bb8cca SHA-256: be27d1724f57867adb1a2a78cf0175e4fe40a6abd8bf0173fc5eb1f3cc442f6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a link farm pointing to compromised WordPress sites suggests an attempt to lure users to malicious content or download further stages of malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mediaworld.pro/ckfinder/userfiles/files/xofijabewufek.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cecf482daa---bibopewiremanu.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lesopifefetidopa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161301fcbba469---36850727276.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/malivalunuwogizaruji.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab07a2a43f---26802492274.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/sedamuranavexalisumipu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dorozopoxinusoxojejazu.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/44215149927.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfe044b12---safekuvajekerulov.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/taxiganolarewu.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/wamazabitajanamiradip.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/fosale.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wusenakufixakoduso.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/namubutujigapubozajopaz.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/44377202559.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bebb7c38548a3c2a7d8b18313836407a/ruratexuwudemiko.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328fcb43bc1---sarasa.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/65124503875.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/36410768717.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/40930410608.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/jemivojunozunisaxizuke.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/todepar.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/15069444124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=malayalam+online+new+moviePDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 17188 bytes
SHA-256: 8411fbc703e7b48644eb8f5e074e98596b13e98e2643f465c37f623e4faa223d
font_01_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 10160 bytes
SHA-256: 1c3d2d7bae2293087eb219db5ddd292dc231754606a60fb2bea6b526f1148a9f
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1