Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcf27a88ae48095…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 03:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0b7837aa2c2725168aa02a1f0e1f695 SHA-1: 51b1384cf4853a0e7b2d32a9410b70d31429d0e5 SHA-256: 4dcf27a88ae480956513b0955a95c503d93dd96589b3691d1896927a371487bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://truonggiangcompany.com/userfiles/file/kofojojosa.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613db14a1685d---zaduridobin.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/xupak.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxiloginibewu.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/votidezuse.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8qj24dp62q6omj85gasjtngh4n/betibokutuvepof.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/kapubevin.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/27018528637.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/nogezibufifomox.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/52700704941.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/gelusavipubudadotoxeden.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/62006867966.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/17445539861.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e8ed74a1---9945611835.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/77195492235.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/25077635255.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/pexosazufotixixatanobozej.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/jelubi.pdfIn PDF document text
    • http://tzsunup.com/upload/wifesak.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/fupulujozib.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/28491139994.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/63817036873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=highway+racing+mod+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 18484 bytes
SHA-256: 7cf76b6ca5c5aa7d2c5288e77ad03b1c6da908aaee2206791ff6b3eb81f1a991
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10800 bytes
SHA-256: 239f1c3d450b4b73d33ca32f3787d4d6b10feea02fa1dce05b8b3cd454dc6c77