Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4470079e038470d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eada5c81e7660eb47fd78b301d970dc9 SHA-1: 60e153767d590ee016b9ce29dcfe55dde75946ef SHA-256: a4470079e038470de666777c4e597e9e1a84e9628309c4bece030590e5ba9c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kasaitogo.com/uploads/files/kupaxosoxoxew.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161407efc2739e---vakivafebolum.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/puxagul.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/6239956454.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/womovafufake.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/gikolelazanizodo.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/11270737460.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6281fddcd9fa674ac916ad797ecd3f71/16839405535.pdfIn PDF document text
    • https://sainaudit.mn/File/kasijuwisenenu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d0fh8tjgmckfn3hvkkt5ft4jf0/zubazemo.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/53524470471.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kuwejuketuvajuwulijo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614e881b5c1d9---15893287632.pdfIn PDF document text
    • https://phm.vn/upload/files/riniwegisasakoto.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/49660577759.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dabuvajuruponamuxi.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/72008901030.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163129c4fa---81920808371.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/19544093089.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/78666504143.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/gerebagerirefegav.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6f81eefacc68d0f92f164c054043d1e/takizetozexolitivozigap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+cherry+orchard+by+anton+chekhov+pdfPDF 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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 10788 bytes
SHA-256: a666aed6f4ce9b90526295f0c5ac5aa4a6a04d2b0b987611e085ba4b5112a927
font_01_sfnt_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 18140 bytes
SHA-256: 4dbc6f6e3a41ae18406abaca8ecedb7928ead837afae42860c78ae6161dd8ca0