Malicious PDF — malware analysis report

Static analysis result for SHA-256 813ead9e9f94ee25…

MALICIOUS

PDF

83.6 KB Created: 2021-07-04 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 106883c4d76c31b427174c4d00a130a3 SHA-1: 1a68a33fb06cb98b99552a804427d4e807189eaf SHA-256: 813ead9e9f94ee25024b0b8cb41bfbbf022e2e32bab4e65a0d0f8a17f9468c54
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs embedded within the document, many hosted on compromised WordPress sites, point to link farms designed to redirect users to potentially harmful destinations. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=rent+with+intent+to+buy
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rnd5n1lc7ec02nabefkd64o6vm/nuxojojesuvoxinolajo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/01vqct1aalq2dmnrssu6cjgk54/96429655368.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/mf7l0vi3sakdkstlntpbkq9r0o/rexuziwowufajofes.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wamafibagugegugavuxuxa.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3e36a71e---87584009936.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b8707380dd7aff693a2b458346579148/lesajizukuji.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7hs5crko5jfl6tcac4f5thpqi1/widuzoso.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f9ea7ee86b1d1941f1af8cd4061a9843/59044753450.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/4074769823.pdf
    • http://ducthoaudio.com/upload/files/77143609306.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdf
    • https://die-elke.de/cms/elke_page_files/file/74138302000.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2c9744a4---zoferakux.pdf
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/tokuxom.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bd673181327545d4491af27729b21628/55094088268.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a46ca5fc7---15882184353.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/40703475312.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f67816d80---sezok.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090cba0dcdf5---68248173017.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fe8820c7---59921217628.pdf
    • http://barcelonasixtytwo.com/userfiles/file/79968520516.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1132813afc9dd5d8040aea9f5847661c/kowagib.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_off0000e515.bin
a0e5131b5c2d63c18ac43d1ee660c789385402400a50ed5495dffeea6eac06a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 10212 bytes
font_01_sfnt_off0000fc02.bin
c186f3d958cf42bdfe86fc216e83f6962241336939a164afe335b85824a633f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 17404 bytes
font_02_sfnt_off000129a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 16792 bytes