Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a8e9d64f56d4b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 23:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c588eeb701de9e66c690f3cb9dbc4de SHA-1: f9053358be654ee34cb46ee4cf18aa78b7d850f8 SHA-256: d04a8e9d64f56d4b4ba86edfb15b865bb20039fb99528af4ef4112e5db18ba0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ncvpte.in/userfiles/file/34270790847.pdf In PDF document text
    • http://rhondachem.com/d/files/14887042273.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nifebeb.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4gchas7tmfs5e8q73dp6rjhlq3/19390948538.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/jevoboposomaxet.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/29907932987.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/67030325867.pdfIn PDF document text
    • http://esteel.my/userfiles/file/48883867946.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/rexin.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f938e37050---jajewurik.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nalusado.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/rifipivabalomobenuj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0ce0d650---dabetotej.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/32683567944.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/mapubezefozuri.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2071133779.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/50890373695.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zesisimowuj.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/nedebuxuzin.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210913121940-donumomulavubatokubuzed.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/85842405208.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///94864103564.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tadozaboxagilememurejin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=triangle+symbol+on+android+phonePDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17620 bytes
SHA-256: 93e2f0bd6cafb606f2e9750a856a35a09b0c58e5683eb9fa048fceafa13e8ab7
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 10960 bytes
SHA-256: ab29f6cf4fae5db9fc62b8e30d61a96a00e1f98a6fd0298c3d3afc06a3c9f483
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1