Malicious PDF — malware analysis report

Static analysis result for SHA-256 985600d6f656105f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d405b64caa47f24c49f7d83eb7dfef7 SHA-1: 2af5391b9d43d65526f31f88f116f70a6a94a162 SHA-256: 985600d6f656105f4ec0b7ff5540d1858f4e7be1e9b65780c7564e88b4607b66
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The embedded URLs suggest an attempt to redirect users to malicious or compromised content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/7j41sfnk0t2lb9d504l6timnfm/14159351135.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ueivtesrvt6oomhrluqna10i2f/xavetapipaderetubufisagu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/42089223372.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/66676722218.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/53607483396.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/jusavepif.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/kazolite.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d70d43a62---24745834633.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/zesoniwamemovaza.pdfIn PDF document text
    • http://paskolik.com/upload_files/fck/file///18151475941.pdfIn PDF document text
    • https://aedwea.com/upload/foto/10399818518.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/bininopugakuxana.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/88586085406.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/jefiwoxijemupubagusexajev.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160821917dc377---wonawifeni.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/41753807048.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/54484612879.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/kobefuwakejotub.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/13111660658.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff47225689---nuxofusutubi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c719605d3a9---bijigolusojevotika.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/mefipajuvekosorezerux.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/83295971893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=progresion+geometrica+ejercicios+resueltos+pdfPDF 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 18268 bytes
SHA-256: 1a2eff9672247a0408092dadebe007a7903588bcac670128a8fc1dd3f5b3e1b8
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 11196 bytes
SHA-256: 280a4c6441987a3f75fcf822acda16f6859a5198f7116ba9106034f13c88b33c

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