Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6de4fefdd77c8…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b6a07287b3a2beed92820c07fbe8c747 SHA-1: d4eaf30067daef75cf518419afcc4f01bc56928a SHA-256: 85f6de4fefdd77c8444a079fa73c8829adc33d76430742b04f5126dc75ad0069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting. While no scripts were directly extracted, the nature of the link farm and the phishing/trojan detection suggest an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.kroonzuivel.nl/ckfinder/userfiles/files/1775244229.pdf In PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/35470246912.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vitukokonarulubakug.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/76870795893.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/619ep0qir44k6f8d2jr92i3mh3/ziguwisemezamosolerevexun.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842bd873df6---vibaxigiweginukurozej.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/desadij.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/004dc46bd64d4aa40d5fb871a1001357/6101003286.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/bozuzexalad.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607270053f42d---12625320002.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9a8b95987ff67e4fd99a09854706c0d2/wigozofenapixe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1e5601bd---xunojusokolu.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/kirixipexupesuted.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/15041186859.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/xagizafifazo.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xemuko.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d396242e---57142677795.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5d4144e2f5bc746769bf1eb7ff6ca23a/43563453623.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/10241391248.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946496ab3d9---livitavud.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e2e2611e02e0c59aec97bf9273023417/mekepalinufilivabuban.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/lopodoroziw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c0515eeee---2115030362.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65316729301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=minimum+funds+required+for+canada+visitor+visaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 17480 bytes
SHA-256: cdea1491c6e2b694dd939c51a3394d9da10639835bd433bf65612d708055312e
font_02_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 10896 bytes
SHA-256: a40319a9ebb1e7cac320e011bd89e2ec4f9923e3b760b8187045432a7b1ae1c5

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