Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae77c2aaf5441e97…

MALICIOUS

PDF

216.6 KB Created: 2021-06-13 17:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 787ad6b5ead5a4887cc14c77c1b52d46 SHA-1: 16157dbe37262e647d4f2e620235e4349a192f52 SHA-256: ae77c2aaf5441e9761673599b5a6262c95c2b84710dc7fc73f01aa366af63d58
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=a+level+family+and+religious+studies+notes+pdf PDF link annotation
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c9b526fd8067394ab3d74c03853e48d/84348472497.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7b43003ce366e08a39c63f4e10698b03/54650594941.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/43871927496.pdfIn PDF document text
    • https://led7.ru/file/80644466979.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/625459828.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/samadabepaje.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083902f80f34---27510901866.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/97821828435.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/667a07afb748a01dd98e39057d4510ab/41374201523.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f08b438---gijagazufejazivajikoke.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080999e98e41---1785217422.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785c515554---gapedirotapexanal.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a04b5e15af438e3042279ab4224f6d46/3544361072.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e44558d9---xolekusisasivuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.orgIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EED3 5512 bytes
SHA-256: 47f51e47490aefe68144ab2bf8f006b6d028d0f6f2a3a5afd3011ca6fddd2f01
font_01_sfnt_off00030192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30192 15188 bytes
SHA-256: 231a64182397eecd766178c9ff1c1c94b21a69d944427e935621144b9c477e7a
font_02_sfnt_off000330c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330C1 3340 bytes
SHA-256: ea46bfa54ac4a025e6dda6c556eb36299768468a7adce9722e55d554d5b3077f
font_03_sfnt_off00033de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33DE5 7204 bytes
SHA-256: 6835b586affb93df60b6184f05fded013fcfeeb0baeb22651116034ad6d47933

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