Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5f88970a193085…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 18:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1d1789ea9928a076436142a62c21445 SHA-1: 61b4b5b97de6772872ba7495aed4886fce4c484e SHA-256: 5b5f88970a193085b175ed4461ed9e78ce42d6ac6ef5a20bf86e42a4b8335c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://budapestpainter.hu/ckfinder/userfiles/files/pozopanuk.pdf In PDF document text
    • http://sxsasa.org/images_fck/file/1631185806.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/girefupidosuxewetapara.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/rujoviz.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/kuxixu.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/31336846601.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/13099015857.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613169568f82b---noguwawib.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xigegogo.pdfIn PDF document text
    • http://weingut-suppan.at/files/50846400852.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/rafimewuwojinifapap.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/42664401360.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/81842485577.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/laped.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/voxulekitem.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pozoxamub.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/a7hhe69854pqa3ssceplbplhge/96125162451.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/wudikozewogo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac4d9ce0---74527681003.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5d2ce43ebeb9e49dfd4efb0b6b3c63dc/69622457271.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/nijovusofijinela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+master+ex+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 10740 bytes
SHA-256: ccea30a19b28d215e2ec7a324e4583e112d2b3c1cbc8384f1cd1e42df95e14b7
font_02_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 21952 bytes
SHA-256: 1e9c219c88839d59af18afb04cde6bce24e3a8181a7e7622881cb8bcc74b998f

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