Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ea2357131496ef…

MALICIOUS

PDF

92.4 KB Created: 2021-07-21 23:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 410b81e4cc8c442fdbbd21acb3cb751e SHA-1: d1c99ade70b7953f1be6db30028af808fe2e863d SHA-256: 82ea2357131496ef913372774bbbf9ca0ab6f863ad565ec1a36fe499e4601dfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host malicious content or further phishing pages. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://vodnik48.ru/content/file/51873167397.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/itij74odvvu9g77i5mv2o6tj02/77774214527.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/xefaguxosugepib.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/duxaragamediwolo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/ff09c70b28b3a9ffb46f38e043f41783/xoxogilaxifajopize.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ca69df8c---43609258907.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zugawuwebuwapebebupabuwi.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/96910904888.pdfIn PDF document text
    • https://0900107678.com/upload/file/kejaz.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/rutaxe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf766ad38---50748240653.pdfIn PDF document text
    • https://argumentua.com/i/file/wukuzikulokalejerus.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/rebatufozat.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95a2da438---balokamigefubej.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/64860243906.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6piiis4vbb12c5b191gcccfjc3/77353741514.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/292496e78e9c36c69f43f83c6b099344/fizajedemomarilera.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/67144747838.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a0cc0e18---vewobilebimaziwululaxu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e9ab984b---pekodivin.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/59a96abf4f06c1bfbec703bfab016bbe/sumobetarudexibakovulujil.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/12242904386.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/92843462101.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/49582159324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bodily+kinesthetic+definitionPDF 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_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 17288 bytes
SHA-256: 88341a03d122c6a5083453c8f401876e83681f76845ef41d61936bf59c1e18e6
font_01_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 10572 bytes
SHA-256: c42d46bf53a83d36ec1ec4e9062613981531a58de3923fc457c252ae00178cd6
font_02_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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