Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cc152c47b7cea4…

MALICIOUS

PDF

124.4 KB Created: 2021-09-04 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45021d54c6b406bbcc6d2d5746ea4d3c SHA-1: d290a817dcedb862ba82720870b9df9dcf556ad3 SHA-256: 24cc152c47b7cea4b8fb9815a299511bfb2c1ec1e014ba1c02f211868a9e824e
156 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 compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jazykovytabor.topenglish.sk/app/webroot/gallery/files/dagonusimabipez.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/zabofonoxi.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/66283426628.pdfIn PDF document text
    • http://recviem.ru/img/upload/sitilezitafabamuwedax.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2c142a97---44444843264.pdfIn PDF document text
    • http://katela.net/userData/board/file/33118033215.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd00bee0607---jegegawumurubi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/45418389631.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kafobapewevib.pdfIn PDF document text
    • http://firegallery.ru/img/upload/36103062994.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmnp6fb2d3bs85pms9bl7rb1o1/zusudemabexigodigisineja.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/7033354603.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833db831761---suwaza.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zopazimodigewekakoka.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a88f0b41---tegilofigadevujaraburavu.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210611000835.pdfIn PDF document text
    • http://dentistturkey.com/image/files/10446736968.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5abc5cc4efcac175db9bc5ccdbadf1e1/30591912920.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/80626402891.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/49831ae06d00c791e008237762d6c886/2964639203.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a13747b3---gisuv.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/givodepozafuzovarin.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e3vecq26k0m683p16qp2h7f9k9kvk6fi/74403909932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=evaluation+histoire+cm2+seconde+guerre+mondiale+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_off00017605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E17 22628 bytes
SHA-256: 552d4b3e48cedb0c24b02efb7a2146d648b7415d0e697dd60e5caa5df1f3bbe7
font_02_sfnt_off0001c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6F5 11336 bytes
SHA-256: 082b9a76b03666b5ca6943de69d39f391cda82dc2881e6fda5c38810a759fccd

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