Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e93be6434998eb9…

MALICIOUS

PDF

92.9 KB Created: 2021-08-07 13:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1c10afe839c9bb765f1b422d2419d90 SHA-1: 7e5ee38484bdfb409de30e14bf278009bbf6bfe4 SHA-256: 8e93be6434998eb94c1ec33a58bbde1b749e0788a88d61e92ee4b717f7e894ab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to numerous other PDF files hosted on compromised or disposable domains. The presence of external URIs and a link farm structure suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vuonlan.vn/data/upload/files/bogazexutamixulekiwur.pdf In PDF document text
    • http://5m-tti.com/uploads/image/files/79465260649.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/68159730684.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65f718242cc9643c421357bded58b809/79230253031.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106192571_636508771.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/50575365046.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/mekumorexovibilezo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6cd3b8f6a0c044a0b2aabc44ea5e60c9/jujarokadukuraw.pdfIn PDF document text
    • http://www.grifin.sk/files/fujetixisowudanag.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wosewikaf.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/mesom.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f046d31b0---96536282244.pdfIn PDF document text
    • http://yuha.be/_files/file/37088260332.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/34547257716.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/80154961534.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d5a95e9bb4d51cc055756bf8a98b32a5/1492287816.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/edce9fa07b8ecb205178ae7e0492e5a4/gaxow.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tett0vfkmn764t1nk58cuk57f7/witanuzamutoxeloweregul.pdfIn PDF document text
    • http://altinay-law.com/images/file/35787381606.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/tiligiwirowijujigerifiti.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/sidosepikazote.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e521867c85f5ac652284aeb49fed7c6e/61505338580.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bf5a88e4---57901823307.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/50114483449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rwby+summer+brother+fanficPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 11040 bytes
SHA-256: 9a9a9a7c8cf5855fafc1f9d64512217677f3f3d70b16ff09692e596364a33d44
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 2048 bytes
SHA-256: 7ab9bc976c2c6f27b07e8af203d00a979577e5c28b882044ebde5d238aa5707c
font_03_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 19440 bytes
SHA-256: 2c262ea95bea7430758e87fd546261de05709ba94bffd5bc3284c58036b39dc2

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