Malicious PDF — malware analysis report

Static analysis result for SHA-256 989e725e1bdbe836…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 23:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e827366ea3e8bf0fa76391cadb57530 SHA-1: b309d1a590a72a4e3b997342da460639d4abe173 SHA-256: 989e725e1bdbe8366ab88e37b534a0a1d5a0a79d94bb9fbb7fc8bc83f10197e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5172561de41545670ee957bbbe90f66f/89713802068.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff043ea6---xosofelejomumoloxab.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/fawotaxo.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66190757748.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142498993037---vugudikanijozobuk.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/tekolof.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140053c6cfec---3736853685.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/16rb49a47cq8ebn35nf32tlbie/sorerunofopogif.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/rawosu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/bqeui7t6k31fpso3p5sk24g163/53085823679.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/10521143077.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50496389571.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/gixogujinagajojuz.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/26617923786.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613226e78b40e---wiluven.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109245254_634934535.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/80117361831.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/pawabeluzumamob.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/12954113820.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/96492846129.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93489452145.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/17390504917.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/pumafokazise.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fivajafominukuvosudimel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=live+stream+djokovic+nadal+freePDF 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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 19200 bytes
SHA-256: 23c5e5d59840d9c0ecfdc3b72ba0b6d0fff9175e380742e20416927ee267ee1f
font_01_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10880 bytes
SHA-256: 11c0625ca713220daf74d53e3b4b857d18401e2cc52ac75165f91b2c0c974bc2
font_02_sfnt_off000136c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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