Malicious PDF — malware analysis report

Static analysis result for SHA-256 f926f0fd9187bc3e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 09:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c983fae0dea1d4b907051e06bd47d897 SHA-1: 1f095b2b31c4466aab6cd769a33ce935301e5008 SHA-256: f926f0fd9187bc3e2d4052e6422c7c409fdd4ca4d08d59989f6e75c4b9d4b1fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads, potentially exploiting vulnerabilities within the PDF reader itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=android+developer+audiomanager PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424a82d6370---15369127664.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eb4faab6c66a00e932944e5eaa3b3ab3/85843145781.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_043542.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109152256558165.pdfIn PDF document text
    • https://vitanov.rs/files/golijalararag.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142000dea935---runemoguvapow.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210906070726.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/90473663895.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/81ef80b847976e55398cab101e7d7e8e/furazowagebafumunimotuxi.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zoxusurakebotewis.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sazilimewevevokoj.pdfIn PDF document text
    • http://compsult.net/userfiles/file/muledejazumo.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/13/6071182936.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/29030571959.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfdd57e38---95690635739.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/70300471991.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/45786147198.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/51658826252.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/58009489457.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/muxale.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/16056361775.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/41452814942.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/petokezujesezasoduxunid.pdfIn PDF document text
    • http://qdcmd.com/data/files/nipolo.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10616 bytes
SHA-256: 8208031ca3b324f66c623f364f1acdb179d4624691574fd36165342a9c0fc4cd
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17772 bytes
SHA-256: 298d39f898bf159f2facb8c1749db8b3d70963baac7c0e8f9a9e6d7efa4244ae

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