Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee989a2d630f23a4…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 06:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c49b9f775cc638cb83d7fda13396b7fc SHA-1: 9c750f73b6fa6686fa50b11aa7bd1ddd2c97eed6 SHA-256: ee989a2d630f23a4a2d60ac0a911b30e68ea253c0a287a8eb05f27539b3ef234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.brickchamber.com/ckfinder/userfiles/files/rozuvobi.pdf In PDF document text
    • https://kingyao.com/uploadfiles/files/20210909_095546_9510.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/xatabudurud.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/vuputinireraxe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d4675604ef153ae8ae9f04543db5f144/71201073488.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c3cdcd702c6abdde8e3ba84a0c0b9cc/wepuxilununudizud.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/14427858090.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/61381715561.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/burizolo.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/55975028105.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/53572608168.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/soxitixive.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e11cc89---97208459762.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/10033364982.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/mepage.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/94888563184.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/zinuxobuzezulukixorokiv.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/39692790778.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/koxijozemi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4mbnj3d9b34iehp2ur60c71qro/8830697237.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/53748417797.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/83868962643.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/95427741327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+life+monty+python+streamingPDF 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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 16108 bytes
SHA-256: 27e59a90d8fa7a4761a655f0436155e975b3a587f61a62c5acefc6fe26d9dbe3
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10912 bytes
SHA-256: ab78b48765b0eb5f9c308157f104e705d6788a23cee6c96d14778194efcaec47
font_02_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1