Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a5f5a9060f51cc…

MALICIOUS

PDF

89.3 KB Created: 2021-08-12 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 843519f463948838507e7ee83d1fbbfc SHA-1: 6ce46a6674126fa8afa452c88e191cb161ada471 SHA-256: 90a5f5a9060f51cc265d6d900b052b54a4dadd697e18f0ed59547d941c4aad5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d765da---vuzoxegepixasebisakujewuk.pdf In PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/14892759887.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/89362778735.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/tewixodiw.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/91998920063.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/27174220050.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/lobifebumokibeke.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4abba8833d---wavulaputunel.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/garif.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/jolaviwitezomejidigipu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vrn027d2am6f2fng33e3ke1bba/goxejigulo.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/nagaleruz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fb802315044---penuraxipobagofulelipir.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a0f8a28add48028495d338fd401aaac9/24959220612.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ab9f4dcd8a525fbbafa78382d15a376a/2949215369.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/42084549217.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/kademupakekakeriraneguk.pdfIn PDF document text
    • http://elitvorota.ru/f/file/65019927815.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/54207680746.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acf60e18a52---labikokifu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96a3dfd24---60710291194.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b2b5f4f6---12306460062.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e8412492---19949515093.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/mutujukimaletero.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b010d5a3---panegofepuradajaxalesoge.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e408d7378a---13191070046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=list+of+dr+sikiru+ayinde+barrister+songsPDF 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_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 18140 bytes
SHA-256: e40d4f0db22dbcc3f8f4c8e83a0f9bb7022c5a87166be79537a5d1948aa3496c
font_01_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10888 bytes
SHA-256: 53a010db7e7f7f47af6001de55734689ff97c95fd2e89a38390f5d120140bf20
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1