Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd5f8f5b3ff7a67…

MALICIOUS

PDF

125.7 KB Created: 2021-09-06 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0e6b3bf07134a327bee60e964504671 SHA-1: 5641d203995a983164e06863a1c1f48a1eb0dfe1 SHA-256: dfd5f8f5b3ff7a6739e5f74e3546209c12b439c5a90244c7bf133b347e2532bd
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as potentially compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or content-distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://arslanemlak.come/file/96008865042.pdf In PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/pegomexipujewi.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/tanefavupizadovenew.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/biwita.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/36643737689.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/234142310609ee2245f393.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/65836766249.pdfIn PDF document text
    • http://gibisch.com/files/files/14247650660.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dd18441---77337609436.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6164f8a3a6d5e9c26cdcb1e65167f781/52793887124.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/digonelepeki.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc03ed679b8---pagejurekikelepufezijuzek.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/51184806599.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/91362392150.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/guvow.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kolejaxokisunufegexogiso.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e5dee419252a5051ecdc800ae743a9b8/rojilawalixukobe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb54d57004---6869605896.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/50401290860.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/vuladubizoxebadog.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/dateworebavajas.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/904a8cea663489830f294c5ae0e89bd0/93905849574.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/82300748588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=beggar+thy+neighbor+a+history+of+usury+and+debt+pdfPDF 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_off000181b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B4 11136 bytes
SHA-256: 4d5278e954dfeb3276ad1e832cdfc33aad0a9aa8b6a257d5f84b2bfcfb987120
font_01_sfnt_off00019b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B44 20552 bytes
SHA-256: d4c33d497e084b362b519d2a9878362b2fd73ea469ee3cd52dd1b11a8baf36de
font_02_sfnt_off0001d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1