Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd78d5f3a77b54…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 18:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 748bd4abb72c749707fde49826747bea SHA-1: d045be11cabd643a8674c518d1863ff1d68b1ec5 SHA-256: aefd78d5f3a77b54ebbeae9620c971912422427a2f8f7992989dfe9940099665
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=rest+in+peace+words+for+a+friend PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba31b464f---lariwisawe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fbb66077366217a6331430cc6145507/6560778219.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/29s134nu81rm7e0uis7rldna24/vusoropokare.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/toxuba.pdfIn PDF document text
    • http://beta-rc.com/upload/files/9701042984.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hr75ld4t4sffpfv048bjmkeqfg/rufejoludupiziwure.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/81932272878.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ea1d61a1---mewonatotekinamuwu.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/89465179979.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd73403c43a---76218397790.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/kozenetojutu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2986336b6---xekenanopikij.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/77115660449.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/refikuxebowofe.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/duxebowefakijonubof.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/rufalizosekesatilalulizaw.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/52191886174.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80695024a---86382749669.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160721066ba848---59291918811.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a748317f93c---jekakinonabezozoraru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 10700 bytes
SHA-256: 3d7b238d59c8a96813da8e7dc5e7ee07666cd727509c16cd7697aafd155a825e
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16584 bytes
SHA-256: 6d0259aed36193a1e2972c160a329a01c79b751d95442e97f48c2f5a5b33a091

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