Malicious PDF — malware analysis report

Static analysis result for SHA-256 85832f8573e07253…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04413a043741295123e6d2cbbe68d239 SHA-1: 2244a3c7f55b12a0c8bf2a3e434fb3951f6319c4 SHA-256: 85832f8573e07253f88c2debc251ab68deabb75e0f5b4c08a14928931d63a2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://austria-ex.com/images/blog//file/muzafuri.pdf
    • http://www.ufolep-69.com/contenus/files/87553182114.pdf
    • https://lienlacanien.com/img_pages/file/73461055995.pdf
    • https://tempegaring.com/contents//files/josunizol.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c2c44ed0a4ef5b7c326d110872f02dff/26386066892.pdf
    • https://gruntbudowa.pl/files/file/jadibivipi.pdf
    • http://zjqzzx.com/uploadfile/file/2021062402462273499.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0048cade75---41047715569.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160842773aaad5---53481092735.pdf
    • http://bsbcarpet.com/userfiles/file/2298898922.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092492786b8b---62664156462.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160758784e3190---vimovufu.pdf
    • http://el-master.ru/userfiles/file/pajamozoritel.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0849f09cdde4f0de1b5f3576c889127a/94228129390.pdf
    • http://pkynfe.net/userfiles/file/moruzeku.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3226d5b504f65793b35cac653202ebcd/2336581015.pdf
    • http://jevades.com/aircraft/fckimages/file/23763987954.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6deb366573ffa8ec43cb012092c8891f/18322129240.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d115028b16dfade42dceb27126362e9b/43866936729.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1g6kd96jhbuv19hprlpabm3qc2/15148396893.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dff599af340---10576531304.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5702e25f4840ea9980cd477d7e634dcf/mekomitogirute.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e5f3f98---bozikeloxuvomesomotufes.pdf
    • https://cytairtool.com/test/userfiles/file/20210629_aeb1c.pdf
    • http://constantemail.com/userfiles/file/1622656612lotovufumezinezizovaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+check+readability+statistics+in+word
    • 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_off0000e6b8.bin
23d0789573e8928c4882b62cc24161eb875d12a01807b6ce20c0aab43d980b27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 17468 bytes
font_01_sfnt_off00011450.bin
dcac97a794b3d1c8a7f7ceeed33d1ccba2bbd6b90a0ef624a0fd37fe99e72fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 10888 bytes
font_02_sfnt_off00012d78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes