Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e51271a13578c62…

MALICIOUS

PDF

96.5 KB Created: 2021-08-18 12:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efd4348053d13db18a06896f6fad36a0 SHA-1: 18276e564c649af8d2edccec9e3c83ac423174f0 SHA-256: 9e51271a13578c6235542a2539ed249c4317c6c6e5be4dd7954405c3f4cd28b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable domains. This suggests the document is designed to act as a lure, potentially leading users to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pvvc.cz/files/652835103.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/214e984e46286c80178309168d757514/siwosesu.pdf
    • http://wumag.pl/userfiles/file/45849382059.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210704135922308598f1aglr.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210714_0D35191DE45F8C2E.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19e5a655---48626943280.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b478ace12ca---37640382959.pdf
    • https://scriptdd.com/_file/file/81739953237.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/26783604403.pdf
    • http://chrislahoda.ca/userfiles/file/wafovi.pdf
    • http://bogelaipigeon.com/upload/file/dejuzupujejagotadi.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/toxadunaw.pdf
    • https://rocksoliddesigns.biz/userfiles/file/92284764693.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc775eeb91---wogemubuxaxa.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/o7mlj1qitcvlc8590j7v0of2m1/14025155366.pdf
    • https://pioneerlift.com/upfiles/editor/files/29229145833.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed5ed9e9a---1882352850.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vigon77eis5pg6pvbqh09akmc8/96230634502.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/wikuwozidikepipija.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1276e88cad---zujonofodufowetilap.pdf
    • http://mail-ex.net/userfiles/file/funed.pdf
    • http://staropolski.net/Upload/file/98766885796.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l8u6cm6quuco54824k8rpj7at1/27390475999.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9a00jqj9n8dsidfg1ere74c6du/masaxug.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ubaa2qvaofekhsd5n378jclov8/redapakujagotidiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jammu+university+result+marksheet+2019
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 16792 bytes
font_01_sfnt_off00012b0f.bin
1646ed9c1a982e1081bcd7aed3eb225f19d91950607ea43f8ce746e9cd87153b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0F 17688 bytes
font_02_sfnt_off00015997.bin
373c280fa1e2b8ce44f09650dd217bbbe6d3fb847599eb3171f2bef9ab0b019f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15997 11076 bytes