Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fec5a72e9eb7f1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 21:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 274b159b5bfe98c16e2967b7fd0d3345 SHA-1: 7cfaf00b08b7e25f618233867d4b092ec39e4f49 SHA-256: b8fec5a72e9eb7f10ad028fdbe8707e91b112aa09cd1a0354ffd319477bdd96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=free+xbox+one+game+code+generator PDF link annotation
    • http://dulichtantai.com/files/uploaded/files/29238686488.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/fetibigekotupimunivemij.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1c033cf6d27292e466ccfb28e8709aff/20310001085.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/573d685f1fdf4d6222b2b92e845ecac4/xorumonaduwojosovup.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xirojagegam.pdfIn PDF document text
    • https://krusomying.com/data/file/teruvavilabikunenuzel.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70735560636.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9148091b0---woketerudemobenaxomekoma.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/bajobozowofuwixowobuguxo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/4378242877.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/nupupidusog.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/17bfdad67d63a37d4a0e8147db8637c0/zosepifokupupu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/5015301342.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acb47634ddb5caafc90da7c27c9889ec/21638450935.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/i12j3cbn7n4gtqc79buc042t3l/wumatosexasonokobirajajum.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/dubuvedukobesoxixik.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/30016213081.pdfIn PDF document text
    • https://sinarwaja.com/account/files/kaketowemakosapuloded.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44680445293.pdfIn PDF document text
    • https://membermimpi.com/contents/files/16212437237.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/gebona.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/19893501031.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83314745061.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/912225acd33c9feeb4fa80c11e258403/98901379518.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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 17676 bytes
SHA-256: 2d49a09816d6e7d9ce9f7e28ce765343fa8fc34a34373a498b25a3a230448079
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 10624 bytes
SHA-256: 131eedf2a80c968c251072374ebaa79ebc62a964e2f0eb5754a3d57dda3ac1a5

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