Malicious PDF — malware analysis report

Static analysis result for SHA-256 194e8cf75ab8dd3f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 23:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d7950c50f759470ee53d4406eb680aa SHA-1: e0f23fa03226655dd8cecfaeaa4ecf0e5382c115 SHA-256: 194e8cf75ab8dd3f15a54b1277c1263e5accb1891c453377a22529316abc8a43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370de30651f---28458139761.pdf In PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/69667822086.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/71437099158.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/pomitowepavi.pdfIn PDF document text
    • http://tcihk.com/userfiles/jijulifazemakol.pdfIn PDF document text
    • https://apra.pl/files/file/zutulolavutufuja.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/23242671635.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/pojeki.pdfIn PDF document text
    • https://brakos.it/file/lelutobuzanusipesadifa.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/pibemelatenuzex.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/lefatibel.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fede729cca21e850c34a9e60f4667d22/88018976222.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gagomigubilarewazebeko.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d545901669---dupipamorikizekasufovudom.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/dejeluwaloziz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161353b93ed70e---67313238343.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/fuwepanorijupowogo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/datofelonawijinukope.pdfIn PDF document text
    • https://adikkedua.com/contents/files/66414055526.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/76226950251.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/mufuwosir.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435f8399ae2---xelubolilobirav.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/26803046111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+take+screenshot+on+snapchat+without+letting+the+person+knowPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5aa0df6d152260ec7e72e65682282161/65681732600.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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16972 bytes
SHA-256: b2e8f0e1a5587cc243c88fd724efc84256e7cffe5a5fcf02683d4606c57daf57
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 10920 bytes
SHA-256: d3d0db67f494c53179d24820cf5b22e4c9e4f41e46a40dc00e727c8000474d05
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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