Malicious PDF — malware analysis report

Static analysis result for SHA-256 498c53b8b5d00ae8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 09:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0672cd4c6785d6c919b6cd1b4f63117a SHA-1: 458e2ff19a3ad5aeeff3bfb5aeeee78573c12585 SHA-256: 498c53b8b5d00ae89e672bf2aa8b2feeb55bd152741ad92c941465f0ae825d76
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. The document employs a remote support tool lure, instructing the user to install or connect with such software, which is a high-risk activity in unsolicited documents. Numerous URLs embedded within the document and its structure suggest it acts as a link farm, potentially redirecting users to malicious sites or hosting further stages of an attack. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further indicates a sophisticated attempt to obscure the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crysiq.ru/uplcv?utm_term=ms+word+2007+software+free+download+for+windows+7 PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869759a0e86---mewajipopatawikemeb.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c623ff21c5---sonisumifudapikevixini.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/xetiwovabirajilutep.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b31951fa04cb7820bf087911ac992bd6/wutulakopedurugiwanolevik.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b6ff167e---34007094202.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bewupuloforazifajeg.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686a7d12b---nidotozuxinapan.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/20417737778.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/69368344571.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zepitukaxovi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/da842a5fe68b106aef4b18fdcbfdb0f4/bezapigodotawa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4ad790ba---fokofemodipumotediwofun.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mizupumubufeg.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0dc6ab37---59063946907.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/gebukurefoves.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/57718626476.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/76828839231.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/zunadulasideselikenuba.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4618f11bb---buwimekalozedun.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/moxazovirigowobasuket.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a4191d9d6d7a3de6c0f0b4015c06b0ab/37415949444.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160982cffdd5b2---temilufoburexalunudid.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/as2fgn7hsfbkt7b1h770bugeb8/bosivifatenuli.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_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10720 bytes
SHA-256: 489106aec113155523976738f2a62e8001b1afb134e8573845ca9990d8fa154e
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16808 bytes
SHA-256: 0bcd9f8fea71e39577e12fca42ed60667b514058e6945ee65228ed127f1fc9ad

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