Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a233c8268511f9…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 10:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77763801ec74ec865fc766d520da02c6 SHA-1: e4e2b98a7d8b00b637f40e55df02f5a27f3fa2c0 SHA-256: c9a233c8268511f9a8ad8ab4213d04f0b367cdc7ef2e9e022b89134893dd16bb
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to various domains, many of which are identified as compromised CMS upload storage or part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=upsc+cds+study+material
    • http://sparan-art.ru/ckfinder/userfiles/files/degegigawosuk.pdf
    • http://applexin.com/ttpsea/files/file/nilovaratenofijegepepuw.pdf
    • http://tindangnhadat.vn/upload/files/jabazamujolozekupikari.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p55lcp3q1macqfg2j6i9n581cg/24831164526.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9ecbd48cb48cfa745978e0d8394a0d47/64139009167.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/fagelifiw.pdf
    • http://augustaelectricalwork.com/editorData/file/punebi.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c20909b5---risapitoza.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/edd8d7e2d41f7820b50970b47ab33f26/genutadatuvibew.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3196f60515---8236743239.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa893296fe2---35278967724.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93879814e---fimatopijazimek.pdf
    • http://shopcloud.cloud//ckfinder/userfiles/files/72873315097.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/dd9fd86db2b2d9e106e1d3afe4505f81/65982675295.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdbbe994e---goned.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11033d654c---gimipozuwa.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b1fa181d---34179615465.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/911e47b33359fea19bd7a1a8d7ee19aa/26366327789.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/shu9kear0kql59uiaggffeibjv/1805219830.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/19e8d11a51312f564961a37d6de9d258/vatujobonitu.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/46c82c88f22ae4b81ac1858823c35fcc/kogupazipinidaxa.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0d41e862a---vunas.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a277b0aa214---nituk.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/p1num87030m82v1p6dul4itvk3/fixovifas.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1mi2v7vc6tt94klg3154ctgle7/1604526904.pdf
    • 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_off0000dfe1.bin
6784432a3afe4ffc6ab2205ad4651c548555cf525f5cbfaaa7b2e2e6b8f30be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 17460 bytes
font_01_sfnt_off00010da3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16792 bytes
font_02_sfnt_off000125ba.bin
215fbb9a29dd8287693d37436de23c0a4da250bcca35511a784e7ff0d7f3a47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 10672 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.