Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c77f58d9705868b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 21:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbe06d20fcd15077dbb85e4519458823 SHA-1: eee1414b75529f8e306ce00a450d86248a164783 SHA-256: 9c77f58d9705868bab7de85edbcfd0e447ab3d8248fbfd24c60a2938bc155a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, likely intended to host malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://loyalangkorapartment.com/userfiles/file/31158470680.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b42b572c---78929332382.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/91795276690.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xujadoku.pdfIn PDF document text
    • http://silver1979.com/upload/file/gemafa.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/ranasonavixokenu.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/82585748989.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3680810153.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fff49c92a---92122392955.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48bcd0bef---31484329472.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/pezebikiwipoxokamav.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/92195657183.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gewuludubupifabijanu.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kezanivuvinena.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abe1e3217---tizowijixolobipabov.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/biximawodatizaja.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/56759069586.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/rivarita.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/motibuxalivonejemetusalid.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/2313984669.pdfIn PDF document text
    • https://x-software.cz/data/file/jufeneximivodowe.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/tejitididazalozutobulo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/90841837542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=image+search+apk+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_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10900 bytes
SHA-256: c53e0771b8342f733e2a717111a154a3d18ae48e5c3eba5ce859ec09712fb744
font_02_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 18392 bytes
SHA-256: a5ae00e2a51f70798e956c6e2255ea6f5d0e0c190977a965f6c7012d78df6770

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