Malicious PDF — malware analysis report

Static analysis result for SHA-256 494f5961dd6de9d3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-19 01:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b95f5fbc5d3ecbc1f2c872edda81cc88 SHA-1: 913954e94ed5c7cfd1395c4b1572dc57378117b7 SHA-256: 494f5961dd6de9d319851ed937080f817cf411734eefa8eb23d24b7736abe27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm heuristics strongly suggest this document is a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bukharaatlanta.com/sites/default/files/file/tatixejalavutebuxuzafata.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b92b12622bb4ac3942376eb3603111eb/boxejojomokefuj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b27342vv0hd81cds7v7b6fu35r/60760336485.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd4ab70260---daluladitunozovumilo.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5ufc22regn9u1i05g2ti81i14n/16825442106.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/84191193108.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26be04aaae---muwilizelopiwitevokuka.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mm7sipq05nu44kvuc4g4k9pqbk/40939585222.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/90212148681.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f7904ccf---xeruritilu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3de10c20a1---47126648667.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/70788367219.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/64646507939.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/riruwexafemowoli.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/tolinulofesugerovukij.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/824edf17229ffc67e3f534039a8cd6ae/91051068891.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/mejubomurivasedewiv.pdfIn PDF document text
    • https://0900107678.com/upload/file/21309693052.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c8fd3c6ec---wototimemevawizodejopofa.pdfIn PDF document text
    • http://learningkey.org/userfiles/kejemulejofemabetud.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/vatexumujadilapupusilivo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6cc52809---mutekubufinobogixapiroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aesthetic+things+to+paint+easyPDF 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_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 10600 bytes
SHA-256: 843506c91694e91a7cd3341d705cfa0210f420c2489364db6122cb2285449387
font_02_sfnt_off00012bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB3 17320 bytes
SHA-256: 57ecb471806232db683474561990eafcc0c2bf157e5520c3cec5c58829f5c819

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