Malicious PDF — malware analysis report

Static analysis result for SHA-256 54788c289e4a6df5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 03:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8141dea00facd2654898ebcaf8c9ee76 SHA-1: a35448801e4f29ad757c8a59fec83b9d85d11c92 SHA-256: 54788c289e4a6df547337b797a160dbda706bb1f88053cfb4695bede7b5a595e
164 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm on disposable hosting further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://architettoletiziamasciotta.eu/userfiles/files/fuvudovesijij.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f34e57c8---peditifujonudo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ff4c36c18a1c29a1f3e70a5504ab3e4a/pozen.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vkdsia666tvvk5o9s1a2mgarlk/lotawuses.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/keridipaj.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/21244600437.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/vimudukozuguditu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gugudamunilo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/601759b5ebb2b904a5a9d5c500ed94f0/15533116935.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/57779166260.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bosivo.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/tifeb.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cd3d713e---jodedizimulupekif.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/80627673424.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/88885717756.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bbe23a42---42603673387.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_234900.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/tobuneriju.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dedirepudijutitugupazi.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/pinefodobawu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/43018718977.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/55378191880.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/84912482173.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/82206285080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wazir+full+movie+free+downloadPDF 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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 10552 bytes
SHA-256: a21ee63d09c8c62074a6b1878c528cb5779fd53182a7e4abb325b64ef3aff166
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 17788 bytes
SHA-256: 4bbea966c9a37fd5dc00f22a0f6e8c8ad008023eaa5549eae8e7faaf34853578