Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4408330cb7665c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 07:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8f10f8f4a0df490fb292ba265c40977 SHA-1: 5b6f2b8c61775d473471f9cba9c343b619e44dbf SHA-256: ab4408330cb7665c5b516e8c7c2cc5a41f189bc2f3a249bba2f88d96911ab99b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malware or phish users. The presence of external URIs and a link farm indicates a malicious intent to redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bebsulmare.com/userfiles/files/55114068199.pdf In PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/32065284502.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/63620369785.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/pulisodoga.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161261e8e25a7b---tinefuvajanebozob.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/suxete.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ru8smvmqh6q499dtdqbp8sfep8/xagowalinoliseji.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae250e1e970---48525620998.pdfIn PDF document text
    • http://nanopena.cz/upload/file/4179886763.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/71300334751.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/favumevedefawov.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8a23b528fabf9640c8f31c230c46df14/92440713059.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/22468322421.pdfIn PDF document text
    • http://charontrade.hu/data/file/bukalaxefa.pdfIn PDF document text
    • http://emeat.ru/var/files/9359000063.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d766de5554506ce3daadeffc260224c/gukiserazutajazeginowu.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/ximetodigopazibifodokami.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/39c215472aa7d5206edb4d4bbf4c3f52/76225458235.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/munaxigobubote.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jixezafilagexesimusaged.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e277dc659---94520105028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=polygon+graphic+organizer+worksheet+answersPDF 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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 17284 bytes
SHA-256: 6a0d06d355c6c7d789533209a695adf9ebac0a7307368b29a21784294faa4d0c
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 11008 bytes
SHA-256: afeefb29095035ec6817d7d0d4f9084b3d379b3529e3682408e962080552eb26
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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