Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d8db998738d7e0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 01:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 051b53def6f4ea9846136c495e8de239 SHA-1: 2347d9a6f6be0116b44b9d465eab951e5d358c1e SHA-256: 87d8db998738d7e0d1544cce1a6960751a43ccffcd9fffaeebce9525b2ab631d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ibextrail.com/editor-images/73285599577.pdf In PDF document text
    • http://portableandcool.com/files/files/rinunezunisumatonam.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/xilinilefiwibilibov.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/zifin.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/mibajudit.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/jigifalovemubiresit.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/pevurenelunaf.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/toguv.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/34817258984.pdfIn PDF document text
    • http://jsdarvin.com/files/xomezabup.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367681d92f8---xikexolebu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460d599c6b8---muvaxuborufilulanifofur.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/jawewusepatifujidovug.pdfIn PDF document text
    • https://pellevah.com/upload/files/gidupaxine.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27876838334.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f7efe3ho48a3519ac3rokhm6b5/77902922151.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/newegezuladifekowetalafu.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50781534157.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xusuzomerowa.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/popazeluxizavudademi.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/84500641211.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/85913394869.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/tikosifemanorisenumat.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/98135226169.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109051501468379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=imposter+free+online+gamePDF 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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 18068 bytes
SHA-256: 79ea06408f95ac5bd09f9ed46e3c85e6e3a07eff7be9db9d18e1628d49d197a4
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 10652 bytes
SHA-256: 6ac92153539fe8f48b593503620e2b526f1b88b810e8cc6981d9866f4a71f65f

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