Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ebf064e956c4cf…

MALICIOUS

PDF

77.1 KB Created: 2021-06-26 09:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ef59d1b5b31bfe4100fbd8c0eca8636 SHA-1: 00426513d7d008ccdef49438dd1187884cb951e4 SHA-256: 55ebf064e956c4cf1740df3ecb987fb75c7c4d186aced433065073c56e121bf9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc51d391cc---62453964370.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/d32ccehmh3q7urcmo5nk03uiok/lavimibiso.pdf
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/58562341659.pdf
    • https://aedwea.com/upload/foto/72925615618.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9902a632c4---2917476579.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a774efb92---26579997023.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef71278484---rumixaradozelizifixopowoj.pdf
    • https://iveducentar.com/uploads/assets/file/vebakelomak.pdf
    • http://10glazsikeyrosa.ru/file/97308975392.pdf
    • http://poltinik.ru/userfiles/file/83819273671.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607385ab0e22b---62481016274.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608482fd3f206---13148727298.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094805b3d687---rapogetivamaxaw.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a9365264cfb09a8f0b6cb336c4b3b227/64042790272.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33b46486e---lanojoji.pdf
    • https://ebooksweb.net/files/file/13743680359.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9a07f28cef34d66ad13d72c368048198/32332651486.pdf
    • https://observatoire-omic.org/documents/file/nurinubumikilizupuwola.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec57a48e8---51038445457.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nba+youngboy+and+offset
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c901.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 16792 bytes
font_01_sfnt_off0000e113.bin
ec2a420ca84019b7ebadfe0ca3f0cff98e2c8d80f04f887123cceca80a3324df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 17632 bytes
font_02_sfnt_off00010f68.bin
c25914a0faabfe66456b56bf1cc2c04f6ca978b1c6ac824f1e263df5f14ac285
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 10620 bytes