Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78aa24285507301…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 21:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63812af9a8b06095153da4eda71ed54d SHA-1: e84410cf05366cadbd24a5f794f4186355562c27 SHA-256: e78aa242855073014adad95ef5b0d9da091f4b2fd131d6f775f8217890235c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing attacks. No scripts were extracted, and the document body was unreadable, but the presence of many external links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=web+cast+video+player+apk+for+thoptv PDF link annotation
    • http://leton.pl/userfiles/file/1294205378.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337acd76ec5---polametudujiwuselem.pdfIn PDF document text
    • http://hadt.vn/upload/files/fakalefowore.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/17740338342.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/kimemiwadebibabileze.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/soniw.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xetutiv.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/rodewisofade.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/kanaparoxima.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b0a2acc595b3e3df7ed5ef33d31bf758/51316565151.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/56cbf323fe43ad4b219d28699d8ad574/63728850899.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a524174---10482131272.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1c19d49717f002484b4ab68c4469d5c8/nojoda.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tumupumopog.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/peruwuzawoligumi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/20992179927.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15717498812.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/71967144746.pdfIn PDF document text
    • https://yasacompany.com/upload/files/65534488723.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/78104972404.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef3e69f9faae456b779b181a9110c6ac/41509078865.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.pdfIn PDF document text
    • https://cmf8.ir/data/file/tazonemivo.pdfIn PDF document text
    • 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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 11020 bytes
SHA-256: 1080e25db09df44ee64ae8fd5b4ce58659aa87d52428867088354afb0e809cff
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 19572 bytes
SHA-256: 8314403d4f68cacfd55c5f680923e70529be61147afd4872070f46f462b7baae
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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