Malicious PDF — malware analysis report

Static analysis result for SHA-256 076430f17ed4650f…

MALICIOUS

PDF

124.9 KB Created: 2021-06-25 15:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f12c4091ccb6eead7331bab17322e8ed SHA-1: 4566e788f7095766c85f428fa5c67ed3577f4091 SHA-256: 076430f17ed4650fdcc3ae82e651639450d6b0e8dca64f8d4497b2cc0b38621a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=different+types+of+alphabets PDF link annotation
    • http://amctop.com/board_data/editor_img/file/202105200343.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/49109044653.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f65314dc5---fukumugavipudo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f939973a9---75096611703.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4499318fcb0a9e85cf6b2aea297f9027/63094525806.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16083e7832c1dd---nilaguxape.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/46196372777.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/24054047730.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e110343b92---letubiti.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b7101fb4---77991420882.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2b33420c---68077467455.pdfIn PDF document text
    • https://polandpools.com/contents//files/7390620383.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/95035281270.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3ce00c84---76556568200.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A3 37300 bytes
SHA-256: f3e45981bcd165e010b353efd8952d17334483fecf49bd71bd5610217c56b346
font_02_sfnt_off0001be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE87 10708 bytes
SHA-256: 79b3929bb22c9186e23dd96ae02f1e7771284baeec210f1c59cee5ac95c9192a
font_03_sfnt_off0001d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D2 4316 bytes
SHA-256: aea9543ec0476d18546e8f6ee453b61ee028f4239ec41d79ff53140401df3296

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