Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cadb4825b38b851…

MALICIOUS

PDF

97.0 KB Created: 2021-09-19 11:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74b529eec2d64014d276011e52fe95f7 SHA-1: bb56c87e4134df4d6f5b0907d6e39eb9d89962bb SHA-256: 9cadb4825b38b8512f4593a3d45e3dfb008339a6c11c531aef5529332201f5be
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to URLs hosted on what appear to be compromised CMS platforms, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://madhubanindiancuisine.com/nbloom/fckuploads/file/dirawaxunukubekupifidud.pdf In PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/40989279729.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/72468131157.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/lotam.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bewanizini.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/190713449194.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/63188444541.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/rofuxixo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/49313064653.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/solinifiramelivexi.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210910193619_1979640145.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/fikaduwu.pdfIn PDF document text
    • https://sainaudit.mn/File/16747728255.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/paridutirixanibiti.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a740ad0ed1---69017850222.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d01556c62---wemixebosuxawomidip.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jejevivonobukofisuzezok.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/62552624041.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9e7dcmcotdh1nbuo91omluf6bh/datibi.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/wovuj.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/wolinow.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/suloxafovagak.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zatowesusizuwu.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/91406371236.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137807a32388---36283452570.pdfIn PDF document text
    • http://metapolar.hu/tmp/lowidodevewidev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apps+like+music+maker+jamPDF 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_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 17656 bytes
SHA-256: 93921032d8c8b004125de3f343f9468c572064a53ce64551ec6a02130b079f45
font_01_sfnt_off00014666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7D 10516 bytes
SHA-256: 862533adc384a412d27ffd484a42c735bbef6632f45f85082ecb951f3486e85d

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