Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7157089aa1b085e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 05:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7982be2d4c2dc6a5aefa6b0760657e2b SHA-1: 2cd3a3ac4db087330a4f052b64c544c0c28d348a SHA-256: e7157089aa1b085e8644c99804024957b53e4230e7c6e30eed88e46e80c778e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://digjamaica.com/app/webroot/files/kumewobimubakuwigolaw.pdf In PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/tofovuwijafemefuwanuvada.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wowifulewurur.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba875f97---gudekagugubadabobetegego.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/69972087352.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nodosedalazegikabuzo.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/29704246526.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/33666719335.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/85417729386.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/43135211782.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/namigetub.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/2929467284.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/woxekinawuxudamujiri.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41728863314.pdfIn PDF document text
    • http://e-district.org/userfiles/file/pavufiwovatobibeselekaji.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/wazijivos.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348025b06dc---42370146559.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/59316597098.pdfIn PDF document text
    • http://ux-school.ru/files/files/89005849801.pdfIn PDF document text
    • https://kristinanamaste.eu/files/18443936237.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/88485797298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+imei+changerPDF 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_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 10224 bytes
SHA-256: b969073a4202c2031b5e9263e7689d0b50fb31af5b07a0fd69dbec3d2f70b799
font_01_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 15060 bytes
SHA-256: 1ead6d35d84be50dd1f0c801fc4f05d700b0fd0b754b706d30b60bb5a2344dd2

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