Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ebd04c7751ed13…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 22:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b200262d3fe0d989f3a50515b56f261 SHA-1: 85265aac89c4268b883fe0419c2c3e7a1b8129dc SHA-256: 14ebd04c7751ed13ef0de71ad7a5d47d581d0830c032206c3960a717454e46ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/i69kis591rje8vurmrf8hdph27/ramifodetok.pdf In PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/20285274128.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/iousd3rju156bdcc82a26kcrcs/zebavunidegopirodubodadug.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0abd05af8b---viregit.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/65c5601dcd4af600d643f086aa1334b4/wonunedutetixufa.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/86032896218.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/pasivofopezibuwafe.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/941e1da48c73ece2a2b1fbb4cbc5a402/5807226281.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/nolozesukudi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/tumegagux.pdfIn PDF document text
    • https://rintrans.com/files/lisizalesisiduvologuf.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/7315195191.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1c777b74b2e618eec902bdec430546d5/43476031545.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/lukusagixivap.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/43456343ab7828c513ffd434448056e3/52131815379.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/xesedomexatipotupesigox.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/bekodeguw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d0f0029d---lezudaganoso.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/a2hb1f4q2uc8aegd2gneea9fsd/bikedapes.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dbkjj4v6dhkodmji1jvklgjnn2/44133894676.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kujixamivoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hp+elitedesk+800+g4+workstation+edition+manualPDF 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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 17640 bytes
SHA-256: ffe7a1a9d861e83b68620b63718d2a82d4ea92d1b01a2ec264cc164f8afcc40b
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 11412 bytes
SHA-256: cde1413438e72d52306474ecad5c45351272e963274c651c4ce5c79ffcfd696c
font_02_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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