Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511abaadf6fb07b…

MALICIOUS

PDF

92.1 KB Created: 2021-08-17 05:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa8ad289e29d11ff2e3a977aa3b01cf7 SHA-1: d6c1a69cb6e076122acd88f407d320594b784abd SHA-256: 8511abaadf6fb07b01aadd4e4be6c620bda0aafdab1a88f6712680d7023a4cb7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=indian+marriage+biodata+word+format+template+download PDF link annotation
    • http://519pf.com/userfiles/files/wivinirexurojekugasunipuj.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/ravevudeb.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tudewute.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/2147573438.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/givajamuziwejirefunem.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/n74pp1760kvfar6gsudkdld880/mijipi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bikenemofaguxikegoveref.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/95015141682.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/17124306715.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/pibisebisoxuvepedonafez.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrth8raghq38ol22olklmomqvp/kesozonuraj.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/60969549980.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/81103799484.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/95011336149.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da01e38e14---malofelumuputisat.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/polulonenamixukaj.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/81761608716.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vanososesupukav.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb6707f70---kefowat.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46d383a2d0---8949205667.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/gapofasib.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///jobumimuwagobifaxowelima.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zofoxupafi.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_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10852 bytes
SHA-256: 314e2668c901b2292828325552e3ed75e3d0ee7b62e0b48ff737a1986f833e32
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 17332 bytes
SHA-256: e382ae020b6f09e223cc71f819d15ad435e6f6d221bc69ef234d26ab796a08c9
font_02_sfnt_off00014938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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