Malicious PDF — malware analysis report

Static analysis result for SHA-256 702506b8beecb1f2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 07:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 06e4fc6dfe367fa9844d3ba191b92e82 SHA-1: 7c0eab6c4ca8d0009c811bb732eb24110f441f39 SHA-256: 702506b8beecb1f2815dce05e1a10a9d47a3047985ae4be2264b6321f0ea4840
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://footstepfloor.com/upfiles/files/gemefudexu.pdf In PDF document text
    • https://bocrangsuthammy.vn/upload/files/72875768981.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/bejukejenunedetu.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/lazobajufive.pdfIn PDF document text
    • https://lesura.net/userfiles/file/53861917951.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/37548973488.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/muraxifotasaliz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/307d27a42411a63a2a02902718130d1a/jozojasizudin.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/88166688649.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/7806829680.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/lipudunijuxiketubavi.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/17766938356.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erigit.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/matupadinebelepib.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/29833068708.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/dupovukirubev.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/guroweruta.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613348955f3c4---nabazeferunipejaj.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/lefovimituvezisi.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/41805019608.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/kafefadebogalakalaxi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/madeniduxedodosewatosu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9db1a938dd11c22b9d970df05fcc7daf/mexetidimepur.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/76561988527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=homerun+battle+3d+apkPDF 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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 10788 bytes
SHA-256: b10980513c0f7dbe0a15af02a85e6d2b3ec5356fa22951c499fba58b38cb64bd
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 18656 bytes
SHA-256: 1e78632d33a7e3e933b474185b4b3e0eaa4d1e5b223d35108fa547263b35c6ff
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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