Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd30bfecce4e914…

MALICIOUS

PDF

81.9 KB Created: 2021-08-30 11:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6a5dc43a1a3eaa70654228862a6e28b SHA-1: fee9bec9d3ac399afb424b3c258a2b7a10dc4d0f SHA-256: bfd30bfecce4e9146ace191da28699614034fcf1eb34f5bf16910b8ad04294df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d07971c053d---giriluvinalet.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c35bef505---11929140805.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210705131151.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee02bb12c09---92462909305.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bec26fa39101a46229b220777d952196/60648279796.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/8d30ef874f3559baa00c9961fd9ae322/16970537772.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/ketirumusis.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/8mad8k3pnpdihob6mhrgpalhjc/rulifisepegumudefabijofa.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/55777312322.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071846c277cf---rofurekajexikozisesow.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/bebusuf.pdfIn PDF document text
    • http://schokobrunnen.com/idata/mapukinezebasu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/77889091587.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lovufurarufegos.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/42204370132.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tesiwasumalogedej.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b817d453b8a---37585866327.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97273992a---31188961382.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/wigelijigexabapufug.pdfIn PDF document text
    • http://distributoram.com/files/file/niwaposizolisezetusupuwu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42c95479c---zevemufejobabebudazupuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160988748a2bea---kebodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=isabelle+animal+crossing+drawingPDF 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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 17992 bytes
SHA-256: b9c9bded97e9fb7b4dde69d4b50e44275ca4cd586fc109caf8c578cad1a87245
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10792 bytes
SHA-256: 965c1729ef45502b87fa5f97af28a80787ff8271c8ccc0948a819ba26d93bd3a

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