Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a66ab8ec4ff0601…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2ad8b679b2853e01263fefa4cbc7670 SHA-1: 16235ff61e8dc859a0457dbc8f1742e6235140d7 SHA-256: 0a66ab8ec4ff0601b802b546f042863ae1cc68f2aa4d61e252f738f0f7b1e350
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613704c055791---30274746283.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/6915870178.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72241253297.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zewobelunotosikejidena.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/misisudifituk.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/61845374197.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zokatuteposusegidulul.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c99c433e---48497827050.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/97271253070.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/34639979888.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/vubepuseteku.pdfIn PDF document text
    • http://oodow.cn/upload/file/210916055445553900ahpw46rf2xyf.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/23265553234.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/nofodusupubagubukixaparo.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jutejatoxif.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kuxuwun.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/57739828576.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24863426185.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ribipararomomojafi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa6e7bff---67474588651.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/64101559271.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/melez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=phone+stuck+in+fastboot+modePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/woxoju.pdfIn PDF document text
    • 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_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16876 bytes
SHA-256: 0ec6a70e319855a33824b3486e6ece0d1663432f98dd78dc7a8d3a173df2bc57
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 10928 bytes
SHA-256: 130fcc635cd1e36fe99ef02c5295b05fc3e9e45e2796851040014596101775bc

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