Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafd99277bd62c46…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 09:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9558f30df33b2c03e5e886d7400ad88 SHA-1: 82b62648cbdeab46af88a999f1a1a1107dacdf34 SHA-256: eafd99277bd62c46c7392a169991654757e39e9775f3fe85c4624c5cb182a552
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://emilline.dk/ckfinder/userfiles/files/nijirolovavavidotaxedugaf.pdf In PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/suxibusoditenutixip.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/48730738009.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/1909365230.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gifiwo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/84788391299.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/36849521918.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909010522.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/pivumawesenererizasabof.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/56965743641.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/30097886471.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f779b48c---mogexitidebonipabedaz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/7343061266.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/96920639566.pdfIn PDF document text
    • https://membermimpi.com/contents/files/22059809261.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/numalutame.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/53004385388.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b6736662e4895737468b032d32c12783/jebitolobowebezule.pdfIn PDF document text
    • https://produse-zilan.ro/files/gexegafalupibamax.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupovoture.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4103344724be9ac5c9aad11f76d9b5f7/42568599659.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9pv3a1aehfkao4f3lluios962s/vutubivunotaki.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/zirutomamilurajotadene.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66342975938.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/velowaxofizerebajug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grand+theft+auto+vice+city+san+andreasPDF 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_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 10848 bytes
SHA-256: 15435a372b4a61411a78f285fe8de6a7aa2f9a7e250d4be4ee6d0d5d837a3f24
font_01_sfnt_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 16528 bytes
SHA-256: 40b8d59f5839dca5447c59c6f325a3d174dc37b97bf8ceb79d3572ca90d97121