Malicious PDF — malware analysis report

Static analysis result for SHA-256 4053f463deb49da7…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 05:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a597a3ffb6a6ad78663e8d983b2f5d6 SHA-1: dea449654c9da3776efe0efd2999e3b179a92030 SHA-256: 4053f463deb49da76cdcf7c0acb917aa7cde7cf3fe9e66b297a7009f573929fd
236 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses social engineering tactics, specifically a 'ClickFix' attack and a 'Browser Install Lure', instructing the user to execute commands or install extensions. The document body is heavily obfuscated, but the heuristics suggest the intent is to trick the user into performing actions that would lead to further compromise, likely by downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dedenano.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/58966618892.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/35771425391.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/77ec2e486626557a27b156644b22a5a4/35757272259.pdfIn PDF document text
    • https://menu2uplus.com/images/file/69040464791.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e0efbfed0d97d90b90205b18df8df2ef/bemaxukov.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/dagikijejadiwamovani.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bd37d9db791ff00b47128f8db8abe425/86570108015.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/dosiredotadufozoxis.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc37ad53d---zururi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/tujisemesun.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/gudirewo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28123145601.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/tadotibi.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/52460000932.pdfIn PDF document text
    • http://nfc.soo.jp/file/rimufo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d92b9d68---39200459045.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6875699ea6b07cc3c9aff152692dcd89/66005016377.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ad0999c1---42086593718.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/82102622433.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd122527a67---37469503115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=view+pdf+side+by+side+chromePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 17460 bytes
SHA-256: d3769ba16e6fb01e0c696456470afb8a1950c7935df1e4fa44f04936330bdef4
font_01_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 10784 bytes
SHA-256: 1663d2d491ca1d1fd6f22bb7151bb9652797881de33c98bdeb0a96a6052659df
font_03_sfnt_off00014c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878

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