Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18f6e4e870c14a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 16:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 141038d9ec88981a892492d935cf3808 SHA-1: b3fba39c8069b5b8ec47f531df6afc00f24a4ee8 SHA-256: bf18f6e4e870c14aafc87f986e312f74d4ef9f111a12b56584285d10e49f9ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, many hosted on compromised or disposable domains, with UTM parameters suggesting a phishing or SEO poisoning lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=instagram+password+finder+download PDF link annotation
    • https://dpengineerindia.com/admin/userfiles/file/bewavulasojab.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/389053d57ea7ef72c8b98a1b41da6c3d/karap.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/paponerexobisovi.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/zotitoteg.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/neposowota.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vepozifijek.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1e0ef988fd04d2e205d4ffeb31c73d5d/pupenelibuso.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/jafijukitipaxiw.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/zojuliwosem.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/12035541691.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/15083715066.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vofuweni.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sefebuxupo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133534b31201---82314352036.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210911151249761.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/zujumetag.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/somedumobumovofa.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f792ba4e79---29609927554.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/sekupidiparujobojidena.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/putubifiri.pdfIn PDF document text
    • http://sbcnepal.com/images/file/66630759769.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_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 10880 bytes
SHA-256: ae4fe6ed313265813f22134eeb12e5dda70ef46f7f825a1dd8f7cb874cb5b983
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 17788 bytes
SHA-256: ac4004c8ef80742b88fb23ef4f24a919f82d2ff31fece227d8a05d702366663e