Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b5e814af3b9ee0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 09:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec570643ea1a65ddcbe64d1ed29f5f48 SHA-1: 578cfd5183f22f4936597c372b402aaf76a5d80b SHA-256: 90b5e814af3b9ee00e5147ca5ddbf0a47d4ededfcbfaedcc62c7cb7233301af4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=pathways+reading+writing+and+critical+thinking+3+pdf PDF link annotation
    • http://year-c.com/upload_fck/file/2021-7-19/20210719110049548641.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/murowuxekeliradisu.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210813_114624.pdfIn PDF document text
    • http://askort.pl/Upload/file/92956245707.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tobudijilegazoxe.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210823183654.pdfIn PDF document text
    • http://precisao.org/files/files/72800109846.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/livowepu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/faa4df14d6b5b9bad715ec04ebd87df2/6309371539.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/kuxaxesexowenokeva.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa5e9e056---xebiroxireruvovexatibawi.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/57131917695.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/sobamekikuxededosebopo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/11318862730.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/asvh25dq4bqu6efcbbasbq6tnj/43296549227.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/82okepu2cjab3d31hb4dk5tdqn/pepabawegubinadobex.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/bisimanomimame.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vodagemokenukejoro.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/filuposabemaluja.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4757039a---jodetebag.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/24095916797.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8dam62vsma4dc83l0lkaeom5g4/88464064428.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/41623069467.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/67096043429.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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 17808 bytes
SHA-256: 46bbcc20a26b14ad4bf4d3e269705bd5bb3f0dc1ad6192948c0edb5368c96461
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 11244 bytes
SHA-256: 73eb9a9c7e06ed6a16de16fa0fc2b381dba5a223626929441a81dd48707e89b4
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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