Malicious PDF — malware analysis report

Static analysis result for SHA-256 942847055f13f83b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 01:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19bd469f0f5af2f0f0ebfefd1ef49362 SHA-1: 510c659dba9f5f87f9be1c69b8a9f613ba318274 SHA-256: 942847055f13f83b394121287492c2bbc3cc0d3bffdf1403e3c7f6f5a21684b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ovecollection.com/royal/admin/images/products/file/rodasubobonevino.pdf In PDF document text
    • https://netiko.fr/img/Data/file/vaxijevudusazumimot.pdfIn PDF document text
    • http://minhanh.com/files/23479357051.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/gipowajuwanesujufetum.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021951833238361.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/buwafexe.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/98592804667.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/9744987631.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/57284709564.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/lazegufegisuwema.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/79727200168.pdfIn PDF document text
    • https://fond.ru/userfiles/file/wapetajogiwe.pdfIn PDF document text
    • http://belv.ru/userfiles/file/majozotur.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/92588559718.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164542efa9---selasedu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/pakuvawugujedefa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903132032285019.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/fowinonoxow.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3716ec21f---mexoxidovewotiguwitavaput.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c838466f29---sifanuwux.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/subowu.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/pofofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=windows+8+pro+final+activatorPDF 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 18348 bytes
SHA-256: cbfb70165ccf896e5112951d2accd57984a105fe06f92a671cecc9887067d36e
font_02_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 10836 bytes
SHA-256: 3f1aacb35c0beb9067ac14ad132638c3bcee501c98bb6b802d1239cffce2c6b0