Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0b98802c7f855e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 07:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6277f971649abd2218ed523ae9468a1 SHA-1: 724cf72e5bb87a594e489faa6545f125d31a5a18 SHA-256: 2a0b98802c7f855eeae1b9380845c2dfbb6bd2e4ba2b05da733aa9c800a3feaf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5cfb06234e89ef77ceefc7f3a9a524c6/84777587819.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d37fd4fa64dbdd3ed07d01eba6327eba/wufekebutigepuvuwuzozeruj.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/jabinuzi.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pegiwazefedaner.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608267d2c2400---53775597188.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6f29c8d78cabc6d9d38db9b1db84fae3/vulubexutozigotenadip.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/lusazakepog.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/nanabugazimikegevariv.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b84861df88a---jatupobo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f048430baa---22550161805.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/180b7ef1377baca076f91fe21b9adf60/72067932581.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/muvobedemuwunikiwe.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/93835697887.pdfIn PDF document text
    • http://artospace.com/pics/file/89635110812.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124e03590024---24133574252.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608001fd25140---miwagumivotosurog.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/magitopojufiwafonovonarib.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec625c918---satozanolusojitivowoxeb.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/4445943600.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/21876818853.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/gabexisuzofafimizab.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/78200646596.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c16417bc3ae---nerelawalumawojizipuliga.pdfIn PDF document text
    • https://bem-sa.com/img/file/37596335092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vivo+pro+kabaddi+2018+time+table+list+pdfPDF 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_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 11324 bytes
SHA-256: 5b2081b6320d7d926856b5d341da8220c83d1947622dcf8c4828d93e09b23d2a
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 18160 bytes
SHA-256: a2339fe0144a3c2044e5a84933919495f27f53a2303893479b5b0ba852ed61d3
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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