Malicious PDF — malware analysis report

Static analysis result for SHA-256 9331a3aac8a7e187…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 13:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 126ea2c773be2e7cecc51852d8db6099 SHA-1: 36cb996aea6465d56e99ce211b27ab7feb8e6d91 SHA-256: 9331a3aac8a7e18761bf9f533b4334692844847125e818923f85ad50bdb727d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://adria-ex.com/images/blog//file/vowiwewur.pdf
    • http://assistance.uz/images/shared/file/56094197074.pdf
    • http://aep-tc.com/cache/fck_files/file/49036053555.pdf
    • https://feng-shuiworld.com/userfiles/file/25476173106.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f6333ee8---sikikovujunawoka.pdf
    • http://atenngo.com/admin/sites/site/documents/tofanabajavitezure.pdf
    • http://maciejabramowicz.pl/upload/files/file/sutoxonakenega.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/47826268310.pdf
    • https://x-software.cz/data/file/lileje.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5db62db618ef0ca0a98c34503713a6f8/66844144404.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e823211ff4---49169597430.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcf3165dd---36407242022.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f0f21093---19955392099.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e38ac685d26a4afe2055fc8743399ce/27923544859.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1taettsoo66mfpf98no7a193e6/28745690824.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=life+ball+lottery+numbers
    • 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_off0000e189.bin
8b9648bc1c14474a03b935b0cc35c20abf83b7f6f0497895641b07a7abe349c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10684 bytes
font_01_sfnt_off0000fa11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
font_02_sfnt_off00011223.bin
b5453ffcdb3cc157a70f553a8d3f05c151ac3ddfb53d1d1d310f0b857a0721dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 18012 bytes

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