Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db8db2cb714118a…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 343429e34d142febe2d9e5e3395a8b8d SHA-1: a1732e5b8f0a32dfe99c8e204756da5a8c8d8c12 SHA-256: 1db8db2cb714118aba6f76a8179524abbd62668465f4b822f78d3c4b2075c050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, limiting the analysis of direct execution vectors.

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://www.depomatrial.com/file/6516810987.pdf In PDF document text
    • http://cokhihoaiduc.com/uploads/files/97473409841.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713437ac50---30927315736.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/26khcn9k8duh040h8de8rk99lb/sadewativunad.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rimukudigis.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2fba2c6fb7d8b3ab6414ffbad261b9f6/libuvixeg.pdfIn PDF document text
    • http://kalikraft.com/images/file/napov.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/824ab8a77490b0171b9f38d37575aa23/texabawufutibufululuruwef.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fajowaduwavekumuzumivanij.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a69aab7e4---77889214483.pdfIn PDF document text
    • http://dnepropress.net/files/file/55053982050.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a8797d04c3743eda4abac86a2a665da/43744652603.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/68b2db7b687f060019f78b52a9ccd68f/49254377884.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/6451656903.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/kujulonomamafusino.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/segiwigupa.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/29491982199.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/54970178666.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ramoxemuwekiwobulevipupe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/dea6e6e2ae6bbe427cdf340831afb03d/tetevedazufimajuxovesagar.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bcb0b23e539a5922e1e926c2fe31ed12/vosuxerurupojozijub.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79819159170.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082d97aed791---19404373782.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d2bcd22115661913a5e38ef721303cdc/39020942291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=experimental+design+biology+pdfPDF 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_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17752 bytes
SHA-256: d73ed20c30554567fa62e12dd1c379af43b5c7410df5d33c91685e163116ba06
font_01_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 11180 bytes
SHA-256: 320629840b93337c9b7e10e3dfc23d5dbc5953db157eece9a0a514dc8563d545
font_02_sfnt_off0001491f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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