Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33aaf3cc8eaee04…

MALICIOUS

PDF

169.4 KB Created: 2021-06-25 20:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5c9ffba76ade45f8eed176289735f203 SHA-1: e9054b6202339f4018e5f0a8391fb50cfa51ff37 SHA-256: b33aaf3cc8eaee04a00201579af0354cc5efc8e79292cacc55a4c5b5d4431d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6145

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drafthe.ru/uplcv?utm_term=pride+cometh+before+the+fall+meaning PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c495e5d7bd8---62220229453.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/52371283006.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/09395c5ad53948a605cb616d0b7632d1/xemexawimezagoxewonude.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696e18ec4f---komesivijupodavagow.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/89927173580.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/95293267416.pdfIn PDF document text
    • https://coil.hk/upload/files/34330391998.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/wuneletusejalirulezedidu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8843b51e00d9d9d7f67eca517ab87d10/89148060659.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/zuwigutawusigobiwuduxoxi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160796ae2b56f5---38753042453.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/dorajixarurogowexe.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/jituf.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d99a13341---14999582825.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc4e4b315---pazojokopomuzini.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4v3nqgh8ksap87dg38cdrhj7g6/xurepo.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/47831941862.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c96313830c5---57266795411.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/fc5c76e827122585001f66f0779494dc/navipazama.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bea7c7226.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xepuvi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62e7dea53---tujupebuzev.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C19 10896 bytes
SHA-256: 9f374b3cccd83d8a7a188521784b12d93550ae9d317cfe65601f9f31e0692eb8
font_01_sfnt_off000224d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224D2 29492 bytes
SHA-256: 60112a38c395a0c1d674322e7be26d549a401ca1c69f3303d891278da93fcb6a
font_02_sfnt_off00026720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26720 19524 bytes
SHA-256: d1b772557c2c1d21a6b93fed4f68cdbdcb6bdfcfea2370a41d3c34efd370cba8
font_03_sfnt_off0002889d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2889D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1