Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cea8cb02455f71…

MALICIOUS

PDF

101.5 KB Created: 2021-07-17 18:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f947f979de7cc4e6a7dff550f6e8ce19 SHA-1: b07fd5bfaa696c5aee4fe724dde8d30001d7f698 SHA-256: 11cea8cb02455f71b76395f419f66f2747c4e8fe227c5e696ecde53cb561f063
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall detection profile strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61e14f813---ruvupofadidonined.pdf In PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/53753194535.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/67910732147.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kiwopofe.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/50687979624.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bc09ee86---wolukapuvubanefudavir.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e20d578---sezebigarojubip.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7a2ef509---nujodewenaxima.pdfIn PDF document text
    • http://kfbi.ru/content/file/32729851601.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7d0d7c3aeeda63db2c4c7d23d4615219/16504218136.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/53856538974.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852e8b0e19f---74298761513.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/luwoxalipi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/fozunexuvamigabi.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/91759748695.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pvsat0esphs2f9uk2nadf4ucnk/33635355999.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/dafijovubeli.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/gipixisuzitojijemunopo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/36313885324.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/dafapovi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f2e46dc---40352416500.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160774a9a67bdd---56574910942.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/8358709911.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c8a6e0c4---66913512752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=speaking+and+listening+ideasPDF 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_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001417d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 17704 bytes
SHA-256: e1a4de490caf3ed7d296d33c2a4e61d6671ea9b3ee36eadea0478bff6c504450
font_02_sfnt_off00016f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3B 10516 bytes
SHA-256: 1735f761dd1c5a016a5c9e73fac74b42f88156ae057f1ae3a423276945e08108