Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fceffe20bec262d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b22b072fc4a2be190fda6cc554ad2076 SHA-1: 1b88f74278862abe57808b2c7cce3e796e185447 SHA-256: 4fceffe20bec262d1bd2610dfbe0dfcd7ed23819751a5d7b2e93fbdcc74c1970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studiosiciliani.eu/userfiles/files/30149173592.pdf In PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16447387306.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae260bdc---17451989859.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73a034f4671314f748a2ba84d6f27854/13059975667.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0960ee3ecfec0ca28fcb313b49e2bab9/42211815157.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39f71b2bc1e36adf4d15b3472865cb67/dekaxunodagu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8fd2815869d2bea45db31381ae11a1f1/xizifuzaxiralikevojuniju.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/makof.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1622888566tamelawajanasani.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/40571712035.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/8956395240.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aa19a52c21d---22172201590.pdfIn PDF document text
    • http://01host.ru/userfiles/files/besewoxefaputopape.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106050100303682.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c5d60ac4---zaraf.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083625c1f6b7---86158604225.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0659ca8be1b255ddc65081ede63820a7/xokadotexevosowej.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13733b971---72707299766.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dst2escf46a56ufv2surl4opp0/gavobigawiliwamuv.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aehnmduv266orlenn3vukll4fp/4617448490.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/vuzoxu.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/73868675384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cara+merubah+foto+pdf+menjadi+jpgPDF 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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16656 bytes
SHA-256: d0f03c0d66c567baa7629c16456e46743ef23add097e96d8f09008167c9890db
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 11132 bytes
SHA-256: f0b3e4ed11396b0901c0c3f7ca32d8096576b40c9616ac57909997a22d9091fd
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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