Malicious PDF — malware analysis report

Static analysis result for SHA-256 98395a81d89be783…

MALICIOUS

PDF

101.0 KB Created: 2021-07-28 04:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c73adbded77c4fd2f2f37743960c416 SHA-1: 7c38f059cec59665fcc94c3ad7a412099b9221f5 SHA-256: 98395a81d89be7836243520d8339b8f070d011a2b850129213bccf90bd954f0a
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to lead users to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://onnetsolution.in/userfiles/file/23195977822.pdf In PDF document text
    • http://snotlicker.com/clients/10243/File/47327076272.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6260608f---1290658079.pdfIn PDF document text
    • http://feg.vn/uploads/files/21902110135.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/628d7d9b002936f723abeebff5f17ce7/91521242721.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b03e8bf5b3441586f3d41d5cb95da2de/mezufezujibiseradiramebav.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gewixavufabigutomuxo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/53430165945.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/65731826177.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/xuganaxobas.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/25005126726.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6819b6e---judedelabosotiluketorexof.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/16213811686.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/53bf00892973ede2f03d311f86805e01/gozanetu.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/9020860002.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/jedogegixu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc53bb16b---nogabebexirepolepego.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa792c2b5d---vefibakodusidugal.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/xoluva.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/50323a39c81a006188a9fd7254a0130f/91040099302.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a566d26181f---dafifivan.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/gewap.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23ec3bba13---32018146617.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043008591042.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/16786993015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=seat+leon+cupra+service+intervalsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 17312 bytes
SHA-256: 99c7ee2f17c6fd9382a7d6b32022811742d19d56e8f5f8c1b856f4df4a55583e
font_01_sfnt_off00013eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEE 16084 bytes
SHA-256: 2af06ec2bd43dcd7882560ebe4d44766a7733a9e6da1b8a7754d296041b248b9
font_02_sfnt_off0001541b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541B 10608 bytes
SHA-256: 4c15ac1a3f46d73695740dcf33a4ca1d9add50ebdc1c93f9a73927908267d781
font_03_sfnt_off00016c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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