Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad36a9bbdb875c7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 15:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb576c13fef485081142a8da073e4210 SHA-1: 8d6b1fa045c6d889ea3f9f7574231e9bd709ceac SHA-256: 1ad36a9bbdb875c7a9a6537d188963c787ae4e02556f891d1c3378019ecad7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to exploit user trust and lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=codex+alimentarius+commission+pdf PDF link annotation
    • https://clubforeducation.com/FCKeditor/userfiles/file/tujupamunigukegizu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3d4c7de1968b6bce48cc08805cce0fca/70818695032.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numojokewa.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/dozededorosemosorinok.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57fad2fd9---lebifotorunukokorugulu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee3cdb2c9---parupewojopakapatabiwivaz.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210602004954_bmltYXRpbGlkZXNhdG9rdXhlYm9iZW5l.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1ac65ea77b5d7ade8994e2b1626afa7a/46272370996.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125a2fb0a3c1---gixotowowojad.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/gopupovunejisukizerarit.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/mavibovemuputekalokidivux.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/51760d24461bd5213ec4e39bdc3a82a2/19717370018.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nikujexuditoronevap.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/49043022649.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c67260c562c68766dc8d9eae4d253674/sutake.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/40f2fe25306a18aa6cc8183be2839928/81774689570.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/38185821197.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/89669053273.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f8so2akfr67vcfm5icjtjdmrn2/12625555101.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/92164386152.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa0da02cb5---97207952999.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/86105947068.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/mevajafomudebajavanire.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_off0000bba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA0 16404 bytes
SHA-256: 2a2f9dbada7e33816698927f166e4477d4be6af12529a61656d4b6bdd73e5034
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11012 bytes
SHA-256: c8d00b67ea980e8cbe6f8d95470fba6169d4e248610e5b370d59e068ab31de87

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