Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef7f528a4e78c07…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 17:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9c6d3efb30d1c2dce3ea528290fe62d SHA-1: 0655deb6d608f0943670e309f19d033dca4761f7 SHA-256: eef7f528a4e78c07c1539300486bddb14d41966f9c196d7bb0273f9f30cec2b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files, many hosted on domains that appear to be compromised or used for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of multiple external URIs and link farm heuristics points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lacasedescaraibes.fr/file/wumuwewuxodavuwidezezone.pdf In PDF document text
    • http://chemicalengineers.ie/images/pexofuve.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f55653d79---66207638972.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/65880329624.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/82978936067.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/44119335616.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/82351605809.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/86078953600.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gujaweletadi.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/1366683242.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138380295d8f---14733945210.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vuzokovozitofufi.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xuwutuzaga.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/55304970312.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/vejogarorofuresiwizowon.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/valerati.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/22631235996.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tejatogiwuxemulotak.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea6b164e---xudobusuderul.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/fokovajij.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819a1d5263---55250401116.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/50117911327.pdfIn PDF document text
    • https://jotelek.hu/files/file/50108302947.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/milebelilovopi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210901163053722320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=5000+level+deathrunPDF 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 19800 bytes
SHA-256: 50a31d5430aca9e6ab24eb18840382b3acfdee5c50a6acb7fa4db577c07f4ffa
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 10292 bytes
SHA-256: 3df24960bfecf4bb5b39d2edf909e292c1093b2cd002548b2970f75dc3428e5b
font_02_sfnt_off00012f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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