Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fadc5483fbf468…

MALICIOUS

PDF

109.8 KB Created: 2021-08-01 12:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 947ebbc714398699b6859c978cce4284 SHA-1: 67c11f57e7943b0818a2ed86de26741a5c340f28 SHA-256: a9fadc5483fbf468d03e33f761083ed2bc13e0b6a7608456da7a85e3c03a833b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the heuristic firings related to link farms and compromised CMS uploads are significant indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://hookmyweddingup.net/clients/73542/File/59877648736.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807f2bc5e2---52611491775.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021630103184810.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/29961954101.pdfIn PDF document text
    • https://pmms-online.com/assets/file/52275429225.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kixototewowakavu.pdfIn PDF document text
    • https://congchung7.com/upload/file/95052689637.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/nikurafi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/robofijebavufosunosozawov.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430235020966886.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a025e45e1f---66298279727.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160840aa49f009---54995880045.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701fe4b4a53---xotupimivaletanimovir.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jibilibun.pdfIn PDF document text
    • http://classtool.info/upload/files/gimajejaxifunajobabeto.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gefevirakomogikolekipiwek.pdfIn PDF document text
    • http://samtekelektrik.com/files/bowonamuguvafezuvet.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/v6ole5aggcp0nrs7e8be83hq12/pasafidabadosilolamorixut.pdfIn PDF document text
    • https://congnghethucpham24h.com/upload/files/65359048739.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4ebf36ffe1223097c2fe8decd7a63233/66666422828.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vipofela.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/43417554691.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c82ce032d---lukusivozexuramonu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/42421904601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=moana+hindi+songs+mp3+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 35692 bytes
SHA-256: d6d3d97f78ec4e68ad83c57a462c050368e0f11bf91fbda33ed1e3f1a51a3f22
font_01_sfnt_off0001425d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6F 21676 bytes
SHA-256: 4b05b5915dc47dd10636b2c81cf02d43e18f22588a1a21a28d33db5d9840f3a3
font_03_sfnt_off00018f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F8C 10760 bytes
SHA-256: 8b51c03eb0bb40b0c07029fce5e729d548d1282932a7f5879e393e31e50fb32a

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