Malicious PDF — malware analysis report

Static analysis result for SHA-256 05300d4d7acb9747…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 15:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6892f341ffdcdd771ccee87170b97c57 SHA-1: 96cecfa706be49771fba92cdbf9df7a86cc87995 SHA-256: 05300d4d7acb974741e317d5d4d0f9799e578cac32bbfbf167ace995d0bf0735
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/43c7dca3899d81f3a300e19e0b15d2d5/62313645593.pdf In PDF document text
    • https://frontivo.ro/userfiles/file/najik.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/worowoxeworolu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wezadigonusofuzuden.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/tamuwinijivujurur.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a81eef18---92368709416.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/40553065900.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/912c07f3f5d96c33d2c2ce4fec652c6e/sanozejaped.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/bumemo.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768f0e43f90---34317506092.pdfIn PDF document text
    • https://projetovm.com/uploads/files/lixidu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26e826e014---dalozejozozuroxirenun.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1aa8c4ea---pakifojagusipuwazokemuj.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/sovixiwamixe.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/96832717266.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/1889744137.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/9799462934.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/21587082298.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/37871270361.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gtcivqbpeqk72dq2n26ptdr9k5/wonajo.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vunejediferoki.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/46604750293.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zatibunumimivibup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=collections+merit+badge+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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 18092 bytes
SHA-256: 5239c68a96a3533b680ad819a272bb5eed2bb1d35763f78eb165af8a59dff766
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 11132 bytes
SHA-256: 9af1179fb377e0f3b8761cd0f1e596e0b944f0157b1adb62ab701d808dd6d6bf

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