Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba7cfb9428bf9e8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 07:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41aab61e20ecb4de8d665197e8e6f818 SHA-1: 81c9dfc4b1cb0a780bb0a7c085654833a9fc8ae9 SHA-256: fba7cfb9428bf9e8d649d30f8c4d1e0c90078d80b35db6295966c0d7edfd61e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to trick users into downloading files, likely malware, by masquerading as legitimate software downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=download+parallel+space+64+bit+support PDF link annotation
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/99267851663.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a921491---17004484611.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd281d17bc---66455641192.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/buletelipufuzumagukeg.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sogedefapumomow.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lolomelenowa.pdfIn PDF document text
    • http://sireny.net/share/files/vefivimadal.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/62183817900.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/xuluvugirewoxurogumukile.pdfIn PDF document text
    • https://kopari.hu/files/file/ginepiwopotob.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/lupaxaxuzi.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/32220048065.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/b4psiqdhesmdq71hd9p5vgh0k4/56670737466.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/44357831343.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/muvalorawalen.pdfIn PDF document text
    • http://clickvay.com/upload/files/86911947962.pdfIn PDF document text
    • https://trexanh.net/upload/files/ponijoba.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/84402354210.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/sakipugavebonozawegaxoge.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jefexemubenulutula.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/12563663849.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/fabiwizeluvovepeduvugogow.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/vudixofelojuverixum.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109050112203252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 11080 bytes
SHA-256: d06faef863a745901ceea47deaef5db2c274e4d945ea5e145eaf03623c55fbdc
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 18872 bytes
SHA-256: d4f90410c09f39ac86f896c561ccf93460c64bc086940498290967fef09f1283

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