Malicious PDF — malware analysis report

Static analysis result for SHA-256 49222ecf2f3fb65e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf9d54e6121edaae1da560395af0096b SHA-1: b275ae1eb8fdad116a0dbe20bb2fa8d7aeb637bc SHA-256: 49222ecf2f3fb65e5cbe79c1d0d5378ceeab46416253208e5c0adb6223e9597c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=chord+maroon+5+she+will+be+loved+acoustic
    • http://falegnameriacastiglione.it/userfiles/files/55365944867.pdf
    • http://mercuresamuichaweng.com/admin/file/tovowagojaxovizojizugu.pdf
    • http://nail-free.com/ckfinder/userfiles/files/47745635933.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3d22befb---tesebuz.pdf
    • https://panelshock.com/userfiles/file/derakepakigibiwikakolux.pdf
    • http://daindnc.com/fckeditor/userfiles/file/jabovoriz.pdf
    • http://dekoblickfang.de/userfiles/file/kibamudix.pdf
    • https://aathichudi.org/userfiles/file/21281128680.pdf
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lamavejalaxomowapap.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b31bb9cbe5---tusurut.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/bebametujijarugixoxali.pdf
    • http://studiotrusso.it/userfiles/files/33003058618.pdf
    • http://delfosventures.com/userfiles/files/zevaluriruvonureji.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/11475674115.pdf
    • http://giaydantuongphongkhach.net/images/news/file/xefejenomasojate.pdf
    • https://equinox-e.com/upload/files/31635569037.pdf
    • http://kleiberit.ru/files/file/62629702988.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/42610208207.pdf
    • https://sluganarodu.org/userfiles/files/zimejujepagefojubitaba.pdf
    • http://nrgmedia.hu/files/file/598535365.pdf
    • https://palet-school.com/files/files/genijejugolit.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9357238be---40009381729.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 16792 bytes
font_01_sfnt_off0000c757.bin
485fd519ee7580f0ef60010a5b6f707f86175c3548c6146681b2184decc0dc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 17624 bytes
font_02_sfnt_off0000f4ad.bin
84add704c1ea3317a5cbc785403888d402cdb46fd2a87fa685eccdac58dfa601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 11192 bytes

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