Malicious PDF — malware analysis report

Static analysis result for SHA-256 4352f4c32176cf8a…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 02:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55ae67bd2c2c08039eed68400629122f SHA-1: a64c077b059448bd0c5f2db46a80be0b5c6bb9a3 SHA-256: 4352f4c32176cf8a5a3ab6c42cdf512b3a7b1d97bb2179551f3a1f7d3ee80d22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://meubelenindex.nl/images/uploads/muvuni.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dd4dd815---40387327826.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/96686770879.pdfIn PDF document text
    • http://jawarakreasi.com/file/57430376914.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe99656bd---dagez.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/22608797807.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94ff86b11---poridijerolejonunokenuz.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/19275414608.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/lanulavaz.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/nawapakigakimapuf.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/13134664222.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/97198084668.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/24652594216.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6dca61fd1---lavofoxazejaxim.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/78451532095.pdfIn PDF document text
    • http://canadianrockies.info/files/file/dejunomumowosagiroxe.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/81150248645.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2783383810.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349292a0345---29406379847.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/26675478462.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/89931461268.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/votuva.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/48953869073.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/26245391096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fly+gps+pokemon+goPDF 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_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 10324 bytes
SHA-256: 090a07c06db4e6314ea9aa7b58ac65205c49e0d66b354560d9f60b978b5434dc
font_01_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 18488 bytes
SHA-256: 68e740abea41fba841425145a5c1fa7c2b56b4ae2392efb8776657e4b5efb7c9
font_02_sfnt_off0001492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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