Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ea69286cebb4cb…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 20:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdf7c5e208ea1152b3b6010a9a2ac1d6 SHA-1: 7457ca8790febc24f251907f8ba10965666e157e SHA-256: 27ea69286cebb4cb2c7ca91d86774464b46f5ab9d22e6028aa9a0d04307fbad5
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 an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://griby.biz/ckfinder/userfiles/files/sadibebafixila.pdf In PDF document text
    • http://vigova.com/Images_upload/files/27358447415.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/98000944502.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905195053.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d499169b---54256786412.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/94538712069.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/32970567734.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/18549957711.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/jedinuge.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gunumobumigu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc824346e---52172482804.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • http://kaies.net/upfiles/210906202155792717a7ur0g.pdfIn PDF document text
    • http://candientushinko.com/images/file/56957640274.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7rq6s5ocv9skmt9jmb89hh7b7/40753791023.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/67122062497.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lipotosef.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/43999028965.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/1662033090.pdfIn PDF document text
    • http://jarosi.hu/files/file/72771784289.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/koxusupufita.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/78037479556.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16142820f37216---gifibazobiw.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/98025478431.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/kovowinojalosilagub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=word+bible+commentary+pdfPDF 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_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 10860 bytes
SHA-256: cb221bad1a366151127f3e480b90c6ab11ac6b9bcc2d1b02a1812b3571c00afa
font_01_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 17076 bytes
SHA-256: 1d99e7680417dc60366fa3ca07be6ac98e57d218ffd7fb909281e53bec0ff55e

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