Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b1a4c738f909b6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 07:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1adbd6ab6bfee7992c3c5f51b2e6514c SHA-1: e8d0578e7c3712ed06703974d1491938b670538d SHA-256: 01b1a4c738f909b64448973577722e5df5a6fe5b40d92465bb661326be42de0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://allytemp.ru/uplcv?utm_term=brawl+stars+apk+download+new+version PDF link annotation
    • https://turkuazhost.com/calisma2/files/uploads/ranirafuxaj.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/33348933563.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/lomuselutopikixorusose.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/tarokebomalolivaxuso.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/78860647889.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/zilunizutuzupodu.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/xivijapagugogepas.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/25928923678.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08dca604a70793d4dbb03dc03ba3aa1e/goridopamesiberamejuv.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/42671917320.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/66936234510.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb1bf49a---44720938427.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905181803_aph05c.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagabiw.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/96363848541.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/11036017545.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/basaposesasigaxibusupeba.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/rizifosiregefobazitor.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6871fe61---jubefufer.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/mevibizusi.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41268991611.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/fesizenugirosejojuvowil.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/15618029027.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c43ba3b54---nisejido.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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 10680 bytes
SHA-256: 6de922a037990ff337d5644dd77c41dfa3eafd6e553143f741a3336cc4e6f257
font_02_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 14804 bytes
SHA-256: 08952fce41b739c6869b70eb7f5a70f225b5eceabff8b559202be5343a771944