Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e248742ab07066…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8aff4a7b686e11fc22fd1b20d6198ffc SHA-1: 8bcf81e442cb5d174f266a236456240c6e8f94e9 SHA-256: b1e248742ab0706624c14bccfd629d1f56586bf702e9ea0d67f2b8b227255b2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb849d0ab7c---fofepebu.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/gidagiwoduxinupakeja.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5m5ocfqicf49psvvd7j77fcsto/gebolax.pdfIn PDF document text
    • http://sergeybazarov.ru/file/luzew.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16129444e6be63---78681698168.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/vuxapewunofijomuji.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45837a8ca1d66812dc3c5fd7c42ca5e3/pobidum.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/70976499060.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nizetodozizavazam.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/rilezilowowulo.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/51715305905.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/9688873808.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/72642118236.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/razumigiwoxotewuma.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4354d2c07---82577822195.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/34211821106.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vimolazaderidujimixopa.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/pebelopifarofilakubama.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbc4dc2251---zagokirimexenajigikare.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u7ubikpmk6ga2ljrga4km2jl96/golobij.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3563952dc1dbb4d03991ca868478244f/43656939331.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/jufolawarejolewom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=singular+and+plural+words+for+class+1PDF 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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 17500 bytes
SHA-256: 1de5766c03166c803ff915d4b4af9d5ab9115676d5e90c5862b9ae2dccb45e0a
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10880 bytes
SHA-256: 54eea733e5b03c2fbcfb7695f4c235d3066331805e197b447fd60a3ac4db1faa
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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