Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b85a52ff019f5d…

MALICIOUS

PDF

86.0 KB Created: 2021-08-09 21:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a81a73f5294ddc1bb37e20c4d1328606 SHA-1: 4aba1f8cac09990d42987bb2894c56484e81cef9 SHA-256: 50b85a52ff019f5d1106b66dc829abef3ab13c11ea1d19d74767e05dc5c48e5c
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/36816584161.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef0b3e321---36590270076.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5b2375de3---setigixukelowewagupir.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3975de3e68---wimeditofemuk.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/118c9d09798aea2a67a5982d27c011ac/37992633113.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/18422c1d4584449db0c36597daf55325/41690664510.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac22e3a398---5866501153.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/29749468326.pdfIn PDF document text
    • http://allycatering.com/userfiles/35978098509.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lojekafufulu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71a40aa6f---14852401701.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lolofufariviza.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e425bf7---76137021447.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/zewexepiduxuruwifosoke.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17c4008727c08ed20fcd32233808680a/61940255980.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/minelixa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fadec84896d---ginetudugagadevuje.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/ruxuz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tulowozogimisa.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210719_D5FE17B8C546B3E6.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d9b13cjt6jvfrorebkd3sq3984/93483791951.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/defujotepodaj.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bb87c9b6c---24101417398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+tutu+app+on+iphone+2020PDF 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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 17468 bytes
SHA-256: 7769880c65777d4a7a620aa9fbe03b83d070049845a1cb5e0e8049ea6c2b3905
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 10640 bytes
SHA-256: 6a35085f86cf904cfa92326b609952394985f9d7949c8c4eb4adf6a02f360fb7
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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