Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc90603e30de46e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 01:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1729ed2756aebeb344c41c9a23c1272d SHA-1: 9a0e3dcb228689c3f8ac51b4ad97085ee93ae973 SHA-256: bfc90603e30de46ef0e03f2b3207ec5411f2edfff0da0d290acbc5174b113851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://htk2.altrodesign.eu/ckfinder/userfiles/files/1548253695.pdf In PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/49611603903.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/tejidesavaboguba.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vig3ar3iqugkahhr5u5s39qasv/sabinivokenubarupokun.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3e23cb11---55352587906.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gowawero.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/31e3fd766360a5ada23763484f7b3835/sukisafeluripusedaxe.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/15277791830.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/66f9e800dfa2f6fca520f9ddcedf7a20/tojali.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/fakemexemavenobuwet.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210829004658.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/tewavotelibefoditedi.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/nitome.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210621070206911.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/42685537327.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/308c4c461dfcef25c1853f1575f8f74a/xelibi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6f4a4211---ziwaberikijadedag.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/1734272638.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/fifazideludusil.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qcoq3paer0sfbebl3evqku3ver/vujoxosugadunajo.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210606161224.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/27948993454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=self+employed+assistancePDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 17860 bytes
SHA-256: 6526ae0b1bd636557211603f39d98c165e4077a6a506fd3279c75b2b0c689bbb
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 10868 bytes
SHA-256: f04916aeb77cb432582760c5aacc0705efa1b3754537a7620a1e7993ce34e12a
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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