Malicious PDF — malware analysis report

Static analysis result for SHA-256 34390a64a65af39d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 09:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c3fc9ba301c881f850532ac52d6f172 SHA-1: 1bc31ec11a776e3e1e4f7098b0bfc1b3a4185a8a SHA-256: 34390a64a65af39d7f80213ee40408947ff3bbd96a6f37a6571ebdc708e38fd1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggests a link farm designed to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.moyekolodin.com/files/lulakad.pdf In PDF document text
    • http://capmar.eu/userfiles/file/vogudonilefovisalaboludop.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/97065697999.pdfIn PDF document text
    • https://anfauglir.com/images/file/55862955553.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/9bcd5c4f3616e8a23993e94ba7ec4959/tuselu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/18055396694.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609584f07d9f5---39034122918.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6b4b98e26a3efe948026508b9c4908dd/82309281100.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/77075151016.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/witibagudijunofubixupu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gakivowuwezunan.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/63b13830c2f1b5238a20aa46435783ca/10810092182.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vrqh9lvs0npde2af9kria24v52/49440873286.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cd7f1f25e---muvizumat.pdfIn PDF document text
    • https://eklyps.net/images/file/sevobegitup.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/koxegonezafem.pdfIn PDF document text
    • http://mopron.ru/upload/files/zuposewivojegi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dmepgsjcbhkuph93dfvmr5ufpo/rukiredidikabexekoka.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/dovuwexixabizaxuzoropoluw.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/57464b2cf3f3168f99df171d418846ed/timinapinizunujogerop.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/33774740507.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/lanujusowu.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/55961475317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jazz+guitar+chord+chart+with+finger+position+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_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 17244 bytes
SHA-256: 6dd80320dfa9266ed46ff35b6bed2eec3fc9a5a44bae3f4b7cfa3807850cd57e
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 11092 bytes
SHA-256: 87f4e38e16e536a2173e11d0383af45ac47360ccb841f6c18b11c0b0c1308434