Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb1de7201ef1cdb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 19:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb81b7ae01c7c8675b17bf408afc869f SHA-1: e977804a13691df394fb7564e116bf57b1abdf26 SHA-256: fbb1de7201ef1cdb629a3a4dacfa7e0ea5c7c1fa2788f6f25e110980e100295b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ulv-fogger.es/d/files/78022061406.pdf In PDF document text
    • https://havadisname.com/upload/ckfinder/files/kakiretukekexatibuwi.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/lixugabaso.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16524005419.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/95878435900.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/8627778396.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/54805854139.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/50408842624.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161202271879be---rekexifotosix.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4ffb9839---josunesuwiribelebik.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/41307719562.pdfIn PDF document text
    • http://jaika.in/images/documents/files/guzafetasidotikowuso.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vageraniwilerivep.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/69019169361.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/jukujivabipezijanokomub.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/7434585981.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49305112820.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fisiwid.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/76308038581.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b150742f3e8---79013886584.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/vujubulovizoxifudakej.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/210724180110009157pet49ohmog55.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=whose+vs+who%27s+worksheetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 16892 bytes
SHA-256: e27f57388e16ae94e2571e9a1f03835a1775780835b1907b3a3c493d7b42d1a2
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10072 bytes
SHA-256: a73d76c93ac7ef5ae8d8f8c59061f41c532f11a23044b0286272db74931cd086
font_02_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1