Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c94e28ba75eb54…

MALICIOUS

PDF

71.3 KB Created: 2021-08-29 15:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af41b8629826cb26204400ecff3c63e2 SHA-1: 1d000e8333f3acd64bdaba890a8475abf9f68c59 SHA-256: e7c94e28ba75eb54e6d206325c99aa9b200975f9fb7e595d90c1c895127fa5e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c1ced1fab14fc96b6feb2085eb21472f/zodofibazujesoxe.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa1db8a7f---nasumajexabaj.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/51821939245.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/vixiwemut.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/kufutufarudowibasutubo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7c254482---60584906447.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/61137283086.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831b79b9890---zufewusoxiduselopukuwo.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/46507047219.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/butulurumupu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aefd2e8033e---riroketizuvor.pdfIn PDF document text
    • https://robertbah.si/files/file/pulavotidizaduda.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2650b38953---bozeruwotomoposuwoperazal.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/41174559707.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/pixoxelijefizikoxibax.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805bfe9bb9a---sinopuxa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b24e41212---64558680191.pdfIn PDF document text
    • https://raljob.com/userfiles/file/90854196057.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3833c3057---56482233171.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/ratidemif.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5gj84qblksjt8e20c9nercg8gj/46171495800.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/nefabigaridosatizep.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839e460af8---lusewiwumukidunalox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ce+laws+contracts+and+ethics+pdfPDF 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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 10836 bytes
SHA-256: 630f3782056593dbe39963bf9dbf912a9dda44e43368c3719844fb2ac2b22806
font_01_sfnt_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 15972 bytes
SHA-256: 1935a9c41e26675bd90af0e3667e835605bf8e94537b0f14491b3556fab39714