Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9264412b88a722…

MALICIOUS

PDF

98.3 KB Created: 2021-07-31 10:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbf203a1efa5e90156e01b2f89b04ec2 SHA-1: 071f52897704b135a85c7a2a0074e0a2a5c9df84 SHA-256: 7a9264412b88a72209ff6a57910e29aa437afb8c7584ad1c8c44086768ff286f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown URLs points to a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad82cbd59c---81836137817.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7597fe2809625075305d461453e7e77b/dipilebaropikiguladopimax.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4ffad64bac908bb7efd40241f52a4289/80971659308.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5bba2a3c3308b52f5c72fe637396e9fc/8883819761.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/42748322181.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/91650475038.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/15238566053.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c32e84caa---dikifudulewosatoze.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e049280ac8f52b4ee648b754ccc2be91/zajizibonab.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/61210077949.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/fexalanuzaxizuta.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b08774b82---xikiperuwevobodugubowazi.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/17929362801.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/882535518.pdfIn PDF document text
    • http://drironcat.com/images/file/jesulikidisakojexusenidek.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/tuwuxurojug.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://menu2uplus.com/images/file/88415744951.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/jejatato.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/93820889691.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c058ad2a52---jikanuvokifefofezekiboz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8937362363---88935259896.pdfIn PDF document text
    • http://unityproductions.com/upload/files/86775466277.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6b97f8bb5452826e47a301cdf48bd59f/dojonegebapatofo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073db281729b---39922990814.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5665f694091705692a3f0949a2b61225/53437427205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ib+ess+ia+word+countPDF 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_off00011c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 10596 bytes
SHA-256: 863bcefa2403c28fec4aa70f1c173205b8174ad0c7391ac893da655c8b7d2c89
font_02_sfnt_off00014d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D21 17308 bytes
SHA-256: 621130ec153659e31c9ead2b4f3c911cdd1e3b96cfa0db01d0d38b6d6653fae4