Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a509bfbaab35f9…

MALICIOUS

PDF

74.9 KB Created: 2021-06-12 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90481218fa5f5b0010bb591104429c66 SHA-1: 027edb60cce3c23a6a381d790d0b27ec5c974c3b SHA-256: 77a509bfbaab35f9b346ca36d5057ac610bdd58f5f90263143caf461e9277542
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or second-stage malware. The document body itself is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=the+rise+of+kyoshi+espa%25C3%25B1ol+pdf
    • http://icltindia.in/userfiles/file/97373331713.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd477e86e---kimofofogogigeloriwekuvaf.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/7978719251dd00b4a06d624564f6ab15/89173058290.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091a29666056---filejuzatuwodekij.pdf
    • http://fouladsazanco.com/Upload/file/55607863787.pdf
    • http://ototavandosemesi.com/resimler/file/vurukufa.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01f359de9---31985147837.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb26d4234b---31093070344.pdf
    • https://alshaabcoop.com/userfiles/file/66602375998.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074518304270---wogunez.pdf
    • http://tubietelbar.hu/uploadfile/43850101426.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098848b55cb5---21757923206.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb83229224---34177737225.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fsp1s6mougqi9bkufk70enkho2/4211191688.pdf
    • http://com123.vn/uploads/file/84534335693.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ec3f06f4---82421921111.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4096e7833---jifivuzikowojujatesajizen.pdf
    • http://agnieszkapawlik.com/userfiles/file/95220631765.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9e7c8e91---53729747268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c8.bin
eac5cd66504ce27f261f077a2f10a963e4f76c9a50616a05ac4961541153ba63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 4560 bytes
font_01_sfnt_off000102f7.bin
afe1b52f4a2e1f59176acf7b2f301eb650fb64e589e2271ebed07fc07ffa18b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 5456 bytes

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