Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee90ad7de1b45620…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc5bece9cff848e152946880609a8f50 SHA-1: 30b5ae7b297f2577f5a76fee4ee0cb2cd4d0ebb1 SHA-256: ee90ad7de1b45620f0c072f81b2a5e72f89196ec4b8620be72975611cb9c359d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristics and URLs are sufficient to infer a malicious link farm attack pattern.

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://tutorlookup.com/ckeditor/ckfinder/userfiles/files/pujoduwomupob.pdf In PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/70743606999.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/nuzizidiregomagu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907183223601942.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/32569464216.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/65282822971.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2fa63bbf---rigepedatosa.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/97947758899.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/57242334580.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/bexopemevuxokaxazowunu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d23e1cd8c54463284cefa01f023bcae5/32129883291.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/948702f8826feafc1cdc7d7b5ac7947c/99136533617.pdfIn PDF document text
    • http://willbramephotography.com/32965945606.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/jogobu.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/zolunikeku.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xigagovatoferagizixe.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/zitomamen.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/kogolujukekomawov.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15d84bd60---paxejulav.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tolumilig.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/62941907035.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435194b1bc2---warizomuwusezetizinutadeb.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kabasokadopozuteba.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/94908410107.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/bixopejasosexolevil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=never+back+down+streaming+englishPDF 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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 17840 bytes
SHA-256: e9423913e04b4b0e9557032af4c4b5b76242e187fd30486f2cc86d0f4b04ba65
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 11176 bytes
SHA-256: 5db476d7c17f08cad6a15b5a310ee93ec46a2f79198fa036f388897a76f1cc0b
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1