Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9227fcc387efa7e…

MALICIOUS

PDF

117.4 KB Created: 2021-06-26 16:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d25b6d822a152bc5ae007bb95310e829 SHA-1: 78380f0e5ee6ba8d9455ee30c29c9bb3838c2488 SHA-256: d9227fcc387efa7e986364544a774d0cae50178e88ca56fb28bda39bdd9c6d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://allytemp.ru/uplcv?utm_term=cbse+class+12+painting+notes+pdf PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2030e418d---ronakevaruxa.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/gabewomeguvodofeduxivazal.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4926db00be---pubejinebatomaxe.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210938474139.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/94eb27fc58d9c30903f27751752fcbd2/42301323144.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/jedujak.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/da1a399410a39c84244c6a3077fe4f5c/nixopuv.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c5069e43f44---vaduwab.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/9184889745.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a9ee9b5baa8ed4574115c017847ce11c/mupibijejija.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D44AE9687B3.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a31e443d78917c5d61d67cdd734557f8/39585775219.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r2gek894b7sfnaqjcohca6013l/xelav.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db8247ac9---27779390503.pdfIn PDF document text
    • http://dgjst.com/upfile/file/leset.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be0253b8952---6911469727.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/13343167060.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gerutemulin.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r0t6sqphnttvf06rk540kvbt8b/89053677660.pdfIn PDF document text
    • https://mattress-leader.com/media/gasuvobalijolemosovojapef.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/zajojibumepekesikovasivo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/64luae1397uuuoaolnlk4h8bl6/xurixevawasefukoju.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 20532 bytes
SHA-256: 1e9ef36780b4159041c46d3f4f701da56b9da09a704735b7c610a12d10d09812
font_01_sfnt_off00017f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19739 11036 bytes
SHA-256: 1b2f35d2ab91acc5f3a343567227c6e5f3587bf8db8b25b9e1a32102ad3eab48
font_03_sfnt_off0001b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B6 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742

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