Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae69a861fdf3460…

MALICIOUS

PDF

93.1 KB Created: 2021-07-04 13:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f8fafa59c486174fa61c06061652edc SHA-1: 34e888188c39534e6ab5ebbd55f678e5c23e8acc SHA-256: 4ae69a861fdf3460b4b83ae13ae4f172db69164136c267562e4811c39cee17af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to numerous compromised websites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely as part of a phishing campaign or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=ellie+stuck+in+the+middle PDF link annotation
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/85964195434.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6f887d4e---39569354165.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/87148434201.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be0df085814---13351026734.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/ef47543947aff1cbe5c70a01c501ea40/29864125835.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/zifodizijibuxirunoted.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/lapuxolom.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b0c2d08412854d4e2f23e4443a79861/66403036300.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/40835291612.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j57tipubctmjv8e2915ha35r5i/14535019486.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sk64vjn894hv7c979soc1rjcc3/jadoweki.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f38b7fc4bec2c445d25140c975b7f/dogef.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b49507743ca---lagimegudipewabov.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413af0b593---zevabir.pdfIn PDF document text
    • https://actor-conseil.com/files/file/59273633301.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/nawowefafimipukol.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ab67ae46c9b09b2b3bd05490eda5d967/17090448934.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b55efa44db30ca1f4e74bb0319ddaf63/65436855315.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/wuritizimatu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210618093357.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36ee60c06---9295360479.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210614/file/16236989198679.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4690612246e9ba77e24ef6a6dad58757/62651787310.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t23hcm193crovaqht4s3ctjelk/xuvolubafasarimunonexexog.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/pelexesarinexadizakuzini.pdfIn PDF document text
    • 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_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10428 bytes
SHA-256: a929782e61398f2209cd1102f82dc336a12863a57df8a9e7dfc4c01793bfb49d
font_02_sfnt_off0001374c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374C 18492 bytes
SHA-256: c0f4be34a2ea0d76a0350d24c356b93468b36f67e6762e15736734666b30f39c

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