Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b690af838922e04…

MALICIOUS

PDF

121.2 KB Created: 2021-07-18 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 45beb6dcf6d484c639d8e96d316bc6fb SHA-1: fc216bf58877ca8b3278521bde712e0a8731e86e SHA-256: 4b690af838922e04bb33e97c3bb3d94a5972e47c13c6274e6c83fa8f4af5afd4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

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 https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/76es6q7ep80os4ck3t2a63bbfh/33079124256.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa513607d56---9365788499.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/l41c8qg00f5jh274prglau3vh5/zupiripokukejo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bsd7tbthmigk5pgip8oc7l0av4/54970640469.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/18032490573.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4b9cfca47c3e4e39a6baed76b895340b/20544016453.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/zedawo.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/49529689865.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ci3onne28n9i9gganejshdns08/virikapodonivojevafa.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/veluv.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//malupizomalemidokujejifej.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/jezobokebomenako.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-19/20210619192257809874.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bmcom2r6n773jku05hbejl0j00/vafizazetitonitumugifeg.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085856b409e5---52058641906.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/nemud.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/48012332455.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/wiludipirozelej.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/28800470917.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/12226897001.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ec4772bf---dorikugugesekenu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/43732168407.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210704054817_evvgvv.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210709_45D8102CD60BDFA0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=brethren+meaning+and+synonymsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013477.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13477 28216 bytes
SHA-256: 1b8e8bb37da7b6bd91855a14032ca03147c7196cf9479219aa65828aa609a690
font_00_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10816 bytes
SHA-256: 6d6268fdfcd37d7bf728b8b73315b1b5aaf2e15f61c4da08114fda7fdb986219
font_01_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16821 32832 bytes
SHA-256: e1fcc2a01baafa6c1e219c1487c59cffaeb0397852be82e39ccf7c98a4a87804
font_04_sfnt_off0001b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B307 10600 bytes
SHA-256: 9869aeae25d5ca4864def8029e4c5a7f5b0bad4782bd43752c2e095d12df57ea

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