Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76bdc7ac61273b6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 07:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a2dc88edc34affcff958bb6066979f6 SHA-1: 56f770bf23f7740fa06489c88c6ddbad2c185420 SHA-256: c76bdc7ac61273b6ad11fde239072d4b8ddc9c049a17ea9c895be48c1d299bb3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links, some on potentially compromised CMS uploads, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://optimumquestsolutions.com/ckfinder/userfiles/files/81161848689.pdf In PDF document text
    • http://irodaszer.lukinserv.hu/file/94354881432.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/29056166032.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355476613b9---28729157394.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1f4b88d965b4e9995ac2be97862404cf/68334646156.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/sarer.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/jopax.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sijegivepikol.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/vavujaj.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/78429676920.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/61074230582.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/voxosefesajatuse.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/gelemiwux.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9de83b97---padijefavob.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/99261388482.pdfIn PDF document text
    • https://blv.by/upload/editor/files/loxaborupodatinojuja.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/metisodagogejuwipumowesi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cdc1b1998022067f0f6b8749e09ce1b3/nafobowizexenevoli.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_C537B18AA588F600.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/megedizoniki.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/pawakukojetetigaduzidip.pdfIn PDF document text
    • http://gensugroup.com/upload/files/dupuv.pdfIn PDF document text
    • http://calisnt.com/uploads/files/58926727654.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/tugedudojuputugefif.pdfIn PDF document text
    • http://104408017.linker.tw/files/loxodunepogus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=frozen+2+full+movie+online+in+englishPDF 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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 16384 bytes
SHA-256: 3109afc07435c2bf16b40dc7821bc6805285fbf061f7bae12dbcfcc5d9c64119
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10724 bytes
SHA-256: 0201f4978a3fbd73101261b3129d67a1cbf51fb0b71255d9843af2f99374c754
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1