Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7a83e55c12439e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 18:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 71bf4c953fc0e45e2e1c4f727463cebc SHA-1: 002bae01dcd851ef58a90418cc40ef294233a866 SHA-256: 1e7a83e55c12439e41f7404f690ec022e339ceb62946bd4ba19c671c38f82e4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, rather than presenting legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=microprocessor+8085+by+nagoor+kani+pdf+free+download PDF link annotation
    • http://aarogyamedico.com/userfiles/file/64265971475.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210717071113.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/96212952896.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/kemufajafivu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111506e90f74---wikuta.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626689823.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihocnd20c82uug5ic1j9lac648/kewujexejexavetezujipak.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/rodovoroxisosege.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/dddc90460f0ef2f3d5c9af3540beb2b1/73189241392.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75515dc458---tijel.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/99355682478.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/vonimebapipapiviralixejo.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/28364666481.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-27/20210727231020682553.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/betafadur.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076aa0157ff5---42547280659.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/64f3gb0il3n0f61knh5f49om32/lupesa.pdfIn PDF document text
    • http://scro.ru/pic/file/1784789149.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/k0g6qms7he04adt9vvmr02pccf/2950807391.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/89477484632.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/ferogi.pdfIn PDF document text
    • http://holzweiss.at/xupar.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 18216 bytes
SHA-256: d12f13d9a2c56fb743f12a5d2e61b1fa793f8bc628f44e6b3b1dff93cb2cb2f8
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 11584 bytes
SHA-256: 845e5ac8a8aa99a3016a8b5babda8d12e31208d354e984ca75861578f3d8b3f0

Open this report in the interactive analyzer, or submit your own file for analysis.