Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c797c34a8be8b8…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 19:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18e23c4ff589d3c8df62d042b42fbe0c SHA-1: 12c53ad66da130b04894b2418457f4101b278544 SHA-256: e4c797c34a8be8b81b649ee5c7e0fe6e83820ae8320d8fb4d0685176ea5d2a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb35a551---kebujozoxelibipa.pdf In PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/28560900476.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e3991342fe9f6ebf7bfec80074e603e7/fararutosuloteriragik.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/31309778437.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077937bee423---16610481730.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/103d659d9b21b8f59f7981e7053c5e37/xaxewutomokul.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1bc66970fe3ec35815c5d8b03023ea71/12150912178.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a82936b95---82863313522.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b1ac0ec8f54fc6e4045773f820ce2476/jirelafupijezirewasoso.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c077c210ee8---24390422859.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xesedofi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef48b69577---16492342929.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b076656b09f---gulipexomuxizisuzes.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216975488158.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/72546460340.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dd4378c0---67791974166.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/51f0qb8lt94nouhqa04s5g3ggl/58073689872.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/r270r78b9as6ukd9q5f5rpotbh/basanufosalejozasebaxexar.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/91a79f3f9b20dff68e9237364c2cd8cc/juzuralujewezazagowa.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/nulumetefokejujuvuwofeluv.pdfIn PDF document text
    • https://airbays.com/userfiles/file/faxomufizojorudar.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/916aa1b4a948575f60a328e4209806a9/10304683892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=primary+secondary+thirdlyPDF 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16536 bytes
SHA-256: a78cd6ab76be24c56ea53716650f9b875bbbaa6dd520daf78c71cf21bdfa2ede
font_02_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10748 bytes
SHA-256: c3242ff352576930401efefa32f8b9f9ac4c06107c742cce7c56b5a3dcdd5ac4

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