Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e29bebdda0170c…

MALICIOUS

PDF

90.2 KB Created: 2021-06-21 03:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ae3e6ce780059087598f8dcde5347ccb SHA-1: e1c4c29e2f149f95b2b8880363b78a55d6fe88ca SHA-256: b8e29bebdda0170c1eb51c08b13eab39f774c4501be3fdbe274d45344c2da8f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=gear+problems+and+solutions PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cngksgir2b9gslnmvqcgo7k2ja/bitubodusegirotuna.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rh5ruhadp99639bj5bn9ja57u1/dimaxoke.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6uacpidabt0in887jti81ph9b3/85657489373.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/mapajegoguretebijolene.pdfIn PDF document text
    • http://daydala.com/userfiles/file/28893275414.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fupupasapiwomuxenur.pdfIn PDF document text
    • http://lucann.com/Upload/file/xitiwukegoganejejafuf.pdfIn PDF document text
    • http://www.polni.si/Images/files/nanavi.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gukofoxifenadizup.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/64228616454.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/c3f471rbem8pgnde0dsqvcdcr5/muvemonabev.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/27794522370.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeff38f0a4---38964541871.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c0773405---rojudujupowinurevajusur.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d98fa64c57bcaf56d5e11b233331367a/23990130462.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b575f98673c---40488149041.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 1572 bytes
SHA-256: 86fea18fcca4af12b6451a3a7d82bf074c2f69e1994e916b264d01de7f8ea443
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 5276 bytes
SHA-256: 7f97366324d5ee871cea8ab49bed9c27e3c56992f2d37fdb0fef9fe6f58d3bac
font_02_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 13332 bytes
SHA-256: e1c3f55969f0daea862e2c4386dbfcb76d9be9f1e293fc2a308d99aa12f1228e
font_03_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16088 bytes
SHA-256: ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210

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