Malicious PDF — malware analysis report

Static analysis result for SHA-256 98643b5d6309e210…

MALICIOUS

PDF

89.7 KB Created: 2021-07-29 16:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b83b73a39520aeb456aa13520cccc388 SHA-1: c66c862e725a24085957b1f5d942844956161f0a SHA-256: 98643b5d6309e21063772c6ffc9936dbbdb6764f7c5f13c6c6f136167ed4c390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://archism.ru/uplcv?utm_term=the+norton+anthology+of+african+american+literature+3rd+edition+online+pdf PDF link annotation
    • https://cuisinescartier.ca/upload/editor/file/32344244529.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/46113082219.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c1280bbc868fefa3428ffdc09372ca9f/63327467637.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/26498222970.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/75344184864.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/vuses.pdfIn PDF document text
    • http://unsersohn.ch/images/file/buwitoxukefeno.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ebee74909fa035419edb5a940faa7af8/36588110490.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5457fc6452b9ae06af9cdfee2c4884ba/67327439541.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5994ad121---jatumekagegud.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e22e9ee2d97---nowivubezakofovuronokot.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/warotawuderotasasedaju.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/86563664289.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/578df8301b212259f0b2e291d4e8fe33/46843294672.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/madenisugawipibov.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b21432a366a---wupevisogatuko.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/88289642199.pdfIn PDF document text
    • http://fructusartis.com/i/File/64969060681.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/25116863812.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/86662416129.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/99119472034.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01d6ea588---zezepogotutemabojejawow.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd413a9818d---doromadavavuxav.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/99uopts27nlfq7ack0k2ohess5/38073032356.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/81740386584.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/96233be9067e7be5ef9fd4e51ba36c82/fogawuzimefaxoso.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 19056 bytes
SHA-256: 78a5749613fb8a4efa495c2b0eb89432e0ab6358a30a8090faf5926f97741c99
font_02_sfnt_off00013d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 11248 bytes
SHA-256: 65ab172a51a6f63f0dabfaee70e9fab884ac0bd86a870dcf36c923ab1dbf405f

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