Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c905a32dbb43b6…

MALICIOUS

PDF

90.5 KB Created: 2021-08-10 02:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 89b6e8ca89573f4a6648cb2408b41cb1 SHA-1: 819b9cdf0282155b14310b445f47786aee5b0ced SHA-256: 18c905a32dbb43b65e1f98c3ccfffd901946e9162c80ffcbae0eac0106150006
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d6743e1b6---36343244112.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/nujetipavijezixakosiwim.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2390584d6b445f2006365c9286ef6cb0/33582091082.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/japugemeli.pdfIn PDF document text
    • http://handgun.ee/media/file/wudawogelafane.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/niduledigubo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/070818da82330ffeadd5111357c41905/66273761834.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/57d681011ea02b0ddae3d784e2b615b7/28568237136.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160873b7a9a6dc---figutuxazirefelosijofadu.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/julanakam.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/90887760518.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/755d2b626af903c36b98ca7e1fc8db53/4945542197.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7c32716f---desibokusikevobajutup.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/warapijiwoda.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vetunibepexufixaxemude.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/020dccc6f8fed958f1fa591c7ceadfd4/15986402697.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4abfcf600112394c84474f15d70a3664/lafimapedurim.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/revukijanavaxovime.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021771716554172.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/77782954360.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/8752676730.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0dd4f82b---zisuba.pdfIn PDF document text
    • http://deforma.it/userfiles/files/78604317519.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/08/file/33971901431.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d19db1e43---76142273198.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/raklka5o2rgnkpo12a950ecca7/vimotabarakupidexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+create+an+assured+shorthold+tenancyPDF 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_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10664 bytes
SHA-256: 21ef2ff40347994025d79ad91ef19d72a3abf663b4a79cc72622eb3f898dbd85
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 16812 bytes
SHA-256: 3ee833d73695342aacc0427c79b51132b3e8cc922694b437150eabdd7cc00e6f

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