Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b9b36bf3f4c7ab…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 16:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0f5f53083c06873c0d73421cca929d5a SHA-1: 0c9a2c694b756ac2bf54593a0c4a4f151ef1baf8 SHA-256: 64b9b36bf3f4c7abb22e2fc50200edbd5f0e1533b3a33cac5d79bf211e0ac608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=la+abuela+ganster+pdf PDF link annotation
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/be170422a3df70f505d9860904889acf.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/bejimejeferewisiwuko.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/rarepumuzef.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/65715578522.pdfIn PDF document text
    • http://medrea.ru/upload/files/pimufexugonulevixevabi.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fawazisi.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/53865204614.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/gonozilu.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/ziwet.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/gufifapejejijazofakagud.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/81916319551.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5691119be347520e7267c3bd876f477a/safuvejoruneranojir.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/h7gg146tqatrq929o8jv107vva/54184281041.pdfIn PDF document text
    • https://blogsma.com/files/30436095444.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/58698989158.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/67682359647.pdfIn PDF document text
    • https://pr-dienst.ch/file/mugeta.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/nofilematorudadevom.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d5100d---14026860942.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/rokejofepugelopebok.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/zodujupotivab.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/70091689421.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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 10660 bytes
SHA-256: ab7fe3977a5979dcf40d32422594aa4ba42b4ee2f832183ca8b5b0aa95389697
font_02_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 14772 bytes
SHA-256: eaf29713df744bb2b1c9bce6143f2ec2ba5ef1f48d7778e67f375ed3b0bf95c4