Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e842926897c4b9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6180a4a2dd25bb5b7de06c1b921f7b4f SHA-1: 68fbc3e922fe649745abec6fc8dbd49fed2251d8 SHA-256: d6e842926897c4b93581c34e70ca6c20314f9c9743e7b09c2b9ab3fbdb0df1b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable domains, likely intended to redirect users to malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://stillwaiting.org/userfiles/file/kodelidut.pdf In PDF document text
    • http://royalwedding.jp/images/blog//file/kimitekovadifaramarolurel.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210821_E883EAF26CD1E42F.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xanatanapif.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806c8ee3091---kofukonasiro.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e349d39627---19836742947.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bijivenadigixosajufavu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4891741e8e---votomigozeselulodegodajid.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/mabibodowuvojefodaxenu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8dfd08ea4ab82bf31001665e8878e147/gegarepitaduge.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/48ec692efe897f45ba0275e56aa65c84/rapigetagebaz.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/pulatiru.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/92192358861.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ead62ca6718a472f283da0f56779d566/xerejonowipijusedawo.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/82901508302.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g1v71b4dig9p10m1a1rsi7l685/supomenafujigapi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dkijvhhfp0vhq552n5tk0s390e/40090614581.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/47977134274.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tazapisofizawo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609661a9bebdc---11770392004.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/28552406570.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a059d5c0959---dudinizok.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/15760907875.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ec1b56c2---dewiwujunikutanoripawam.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/sibategerifuxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=making+comparisons+in+spanish+practice+worksheets+pdfPDF 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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 16928 bytes
SHA-256: f5893d0b9136639e093c5f7d68113c2c1f5d25cada0af0371c8eb7e0ab7196d1
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11192 bytes
SHA-256: 23c079f8c820c034d1695564bd304967ce4e1e8a1b40fa12da50866d2f3db3a9

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