Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea97b4b52ae61ded…

MALICIOUS

PDF

96.2 KB Created: 2021-07-16 16:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8a08532ad25a5714bb4cd2a860cd2632 SHA-1: c4c5a281f6446bf5cc5a607353d9213c4e15ad01 SHA-256: ea97b4b52ae61dedc9e8819db23bc139bc6437ba6e717a6989a84be4859766a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://semangkabiji.com/contents//files/55880025450.pdf In PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d742a9a46---31159332254.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0k8n007luqlt8t1qc6fqf5cnu0/zakukit.pdfIn PDF document text
    • http://petrduchek.com/files/14245057892.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/acm7pgsp039oog0630dksud3id/vovatozukujusofume.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/7262534726.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/596d06f2ceb3b10372859439fee59f26/25679280238.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/85433602804.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/91438900026822ea477ffe84248ee2f6/detuxagojuz.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/sawedugudujesiveguzesi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee03802615---253762938.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/temikuritixe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad036aed53e---53076709548.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/litur.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/89055482672.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/97733738972.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/55253253475.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/95062621550.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210702084604.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0976ba30b59091c2afca52f95c31509c/dapudaxiweruvupafesi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2455e42ee---doxemudazimudepirinubuvi.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/rotifa.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///gefajos.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/016cafcb5b7da3728b39bea51967d44e/nuluwojoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pauly+shore+bill+and+tedPDF 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_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 19652 bytes
SHA-256: a2cc6a3d0554a58ca779ef36db2999e3c08ddd75c956d8be3ae991778ae3a429
font_01_sfnt_off000142e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B00 10700 bytes
SHA-256: 919ad317f23abe6b0b446f885eeec0cbe56264cdd0929a5aa4a5d121bca612c3

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