Malicious PDF — malware analysis report

Static analysis result for SHA-256 393afa0306684e4b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 08:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e39b9c6d7bc65b62ddd015ad68c10118 SHA-1: 59c81a90ea56e04bbf252ad62fbf70fe1cff6557 SHA-256: 393afa0306684e4bd6ecdea64718c2e97e1de049ae284d5e8aed06801a51b176
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, including those hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aesyq.xn--p1ai/files/file/20146842729.pdf In PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/19364308572.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/44252313664.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • http://teplospectr.ru/images/files/16844914932.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068865d461---zavivokirawireruli.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/vepabo.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xoxuliza.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mr79h2um1ofophso7rvma5iclk/54758050190.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/dusupe.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/90791940808.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/29128397753.pdfIn PDF document text
    • http://idroter.org/userfiles/files/49541324424.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161341e40095a6---nizusaguvojetano.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d55eca93f---xaxikinavamiredi.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/71932345726.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/ferejinedenureketakamiro.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5f6b7c0e3789006abb85cf4741ed192a/vofoduz.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/mamegalifu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/79978162031.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/nefes.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/72124317616.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vefukiforodenunos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gta+frosted+winter+androidPDF 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_off0000c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 17732 bytes
SHA-256: 140bf2133f107f07dbf52b3dbcb6e84e07ca18e618daa9edd5c30e7c4db11bd1
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 10428 bytes
SHA-256: 7803e28588fceedba7945e9e973f864c282b6f6146467049ce9ee6dbef09ba89