Malicious PDF — malware analysis report

Static analysis result for SHA-256 9546bde5dfd54766…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 03:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e895ef1237b8b6844066d2bb7ac8cd45 SHA-1: 2992a40d79530a15cbe24e39b1a77db9664c78ba SHA-256: 9546bde5dfd54766325e6d11cd1033c668b216b60913982f27b1a1fad7fa29c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=android+studio+download+full+version
    • http://gabinetortodontyczny.eu/userfiles/file/kodiro.pdf
    • https://lentes123.com/aym_image/files/gewebapuw.pdf
    • https://majubesar.net/contents/files/23946770498.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452db0bd63---belexebokekovazajebokuv.pdf
    • http://inwama4.vn/webroot/img/files/56746283338.pdf
    • http://sushiosushi.com/uploads/files/juzuturotibapotizufexo.pdf
    • http://okzawidow.pl/img/upload/files/21148928971.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f3652d8d8b404cc44c01f830b7ef21ae/24062729922.pdf
    • http://bimbrlata.cz/UserFiles/File/rumupaveguxivifomaxe.pdf
    • https://coonvalleycc.com/userfiles/file/56516743497.pdf
    • http://vetsnab32.ru/userfiles/file/galovu.pdf
    • http://around-sicily.net/userfiles/file/83195105944.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d3da1606b915c95f4d02b559332a5e71/29325805383.pdf
    • http://www.icf-plant.com/files/file/naxomu.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/86452371561.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/bikafelejubafewijodawid.pdf
    • http://abwrva.com/uploads/files/sevinodugam.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lifunizaliranevomid.pdf
    • http://mobilesamara.com/img/files/file/xamen.pdf
    • https://dailyhondaotomientay.com/upload/files/guwezipa.pdf
    • http://domesticsolutionsagency.com/userfiles/file/43409126048.pdf
    • http://brbud.pl/userfiles/file/30471109098.pdf
    • http://www.tramag.pl/upload/file/92702913944.pdf
    • http://flairpens.ru/uploads/files/sunojofa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 16792 bytes
font_01_sfnt_off0000caf2.bin
7106349160c6e7e545d75e1c0440c41e714f92d88eb6a3b89ce84218b211418a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 14356 bytes
font_02_sfnt_off0000eef9.bin
acb586da8577dc94f065de02f0360529d06baece1a3c947bcdfcd5ad7f17a441
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10580 bytes