Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9c3e13a376ab42…

MALICIOUS

PDF

145.6 KB Created: 2021-06-28 18:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b4e7848c75f2b0f281b0ad45f8b8839 SHA-1: 871001d2d6745b09cfd6047c83d871053b7cdb7e SHA-256: dd9c3e13a376ab42faf500d3caf4b64fcb76ce2392abcd3c746501efab51b026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other suspicious domains. The presence of external URIs and link farms suggests the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://archism.ru/uplcv?utm_term=god+hears+the+righteous
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8771267625---dudamamelobumefi.pdf
    • http://pogservice.ru/userfiles/file/222761265.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465b95371b---38983609540.pdf
    • http://aihyang.com/userfiles/file/zemamoxorerexa.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/eb8f5da36756e4e06a8c75746ed0e6c8/lokapitoseb.pdf
    • https://anthonygillant.com/userfiles/file/fajinewitogomipapaz.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6d663a76---pimoganiwonefopetejegomos.pdf
    • http://voxel-avocats.fr/uploads/file/dujupar.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f48dbad0---10151031297.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aknvn4lheahibvsk8fkttot78a/bubatabegobobeb.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d399ea9f93---64436841996.pdf
    • https://bistakalikotenetwork.com/userfiles/file/runaje.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2657a51c---40970429227.pdf
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/5765636896.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5ab0637cb9c863b06901096c8608c3f7/kemexisedefimipaw.pdf
    • http://www.odnpoznan.pl/fotki/file/file/66037436160.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/301d9402252e06f26e7e06e0df2d0ad4/5477449373.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3c91f91---28748880100.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3c380d97271f1b260779920e9bfe8b6e/kafovalitafatulaxejovu.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/15298269013.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b4a1c142---87065796967.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca6875c8e---50990912196.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/52486786571.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b35c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B35C 16792 bytes
font_01_sfnt_off0001cb6e.bin
7f9c3c9aaca47716e13b47dbf66f1dde50eab1bd86aa8898f42c04f79a7dc0c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6E 21288 bytes
font_02_sfnt_off000200a7.bin
d43dc32246e9e21be1eab9a7aaaac3b79247e5c4a56652f6de8de8a0182b4b58
pdf-font-stream PDF embedded font (sfnt) at offset 0x200A7 10516 bytes
font_03_sfnt_off00021892.bin
72af497b99780155a0e362620fafb015008fb6de82a1f8bd3b0aeb8548b5130f
pdf-font-stream PDF embedded font (sfnt) at offset 0x21892 19036 bytes