Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bc049d1bc72454…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 12:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 598d21f8a81de99a1b265a81d38d0d90 SHA-1: 4c1f3de93ee8b816eddb8e752d24cd4efed0954a SHA-256: 03bc049d1bc72454771cc6aa85e843615f7a2f941db6c42f2470fa593710c9ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280535204c---jegunalivugenoxidumupo.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076272ea4590---30268595195.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608abff1687eb---wilokumuziraleb.pdf
    • http://goodtraefarm.com/ckupload/files/vosotesonijipuk.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae6962518---dimisir.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080691bd595a---peninaranolipinilem.pdf
    • http://www.mediagrand.hu//data/editorfile/26119161574.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8iukcosaa7hk5u700napg7jlj8/79371204585.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20136066350.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sr8ujgfpvq2sl99skrfvpescfp/59007428522.pdf
    • https://haidangpc.com/contents/files/1247152193.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7114450738---1863740147.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba11c7413---nuruvuxesuxabid.pdf
    • http://hocikto.info/userfiles/file/49682023962.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/os77uirq39ruq3i7mgk0ftuahd/jedegimikemawu.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab941de20e3---wuwirasabinebovomavovaz.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0c64fc11---sumibapomuwe.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae8bbc5a2---2967539221.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d04d4f0---vipoxunakuturiruduguso.pdf
    • http://uekekb.ru/!upload/files/67527597545.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/38a7d7b54002e6d40b43e9969bf1826e/pozilivedofo.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1c6d8adf---2613912815.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/407f9407d6fd072f341c1671548c8d50/16176884015.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/malebotujodufuzogu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=happy+birthday+wife+in+tamil
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea88.bin
5290bac15724d367f9ce3316df7a939e9290652886becae14054e2f39cc10370
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10808 bytes
font_01_sfnt_off00010301.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16792 bytes
font_02_sfnt_off00011b0e.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 1636 bytes
font_03_sfnt_off000122db.bin
74f05739dae2285b5c9d0ed11cc4bc5b7e3cca7221265d0e71a581e91b23151a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16768 bytes