Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cafa5dba0255b7…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 18:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d0e8e0cb03c95ae3775dccffbf0850a3 SHA-1: 6bd521774509496348ff700d4f244500df6340f9 SHA-256: 47cafa5dba0255b7b2312a662e76e37d95be85752d88b6d952e66ec319a0d895
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake CAPTCHA or human verification prompt to the user. This is a common lure to trick users into executing embedded scripts or downloading further payloads, aligning with the 'Spearphishing Attachment' technique. The numerous links to compromised CMS uploads and disposable hosting suggest a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://betentour.com/sites/default/files/file/delulirosuvoxoz.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eae2191f0---sununepeg.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210702_05903A991DFAD73F.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/nutebujokilu.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/98603642260.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/276dee3644a848e30cd29c9c6552aa36/12417731210.pdfIn PDF document text
    • https://avela.md/userfiles/file/74165882212.pdfIn PDF document text
    • http://midel.me/userfiles/file/56562698640.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/30066126028.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0b7b93f6---95832374916.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/zeguraneluberifevez.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ca0d493732ae72c69bcea5a0ccebad72/pivitogilemokevuxoxon.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/davigofajipegubopivudajew.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29555995068.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3bcef4bf5763aabd22ccc799a49e08b0/vepilituriligarafowulet.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tq28vrbmj95u9403quaeervmus/fugufef.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57b787ba8---wijugijogitalazixux.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0b2a2133a16d345361e1a1d3d3e6a466/vixibutuxukabisexa.pdfIn PDF document text
    • https://gilbertems.com/videos/file/90545085817.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/68102122273.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bivobe.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e59716a1c---71526430150.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d83a4c8117ee462d99eee9a2b3661c0e/logon.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/82921753989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rbx+site+codesPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16932 bytes
SHA-256: b77c3d031b2e64f0f51e84ed64fd70be4167996e2a3ecef1752c42116538422e
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10240 bytes
SHA-256: 45573a3071d88a5737589fa8d132bccccf71051a2d032a86fc0282b6b851f400
font_02_sfnt_off00012988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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