Malicious PDF — malware analysis report

Static analysis result for SHA-256 39923e2c22f98c51…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 08:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f921b9ef8f9292718e53ce0c5aaa5a22 SHA-1: bae57a641e460cf337c14b7ff4050905e66505ae SHA-256: 39923e2c22f98c51a0147c80007f811e82e2e540bd20064539b1f82ffa6d0b77
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malware. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for further exploitation or phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713d82e56c8---21646702693.pdf In PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/xomemadupadaso.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kemewusetaw.pdfIn PDF document text
    • http://ipceurope.com/assets/file/34384306749.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/41cdvtvfle7g6cbl4voajmmd2t/65671208167.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30018a9c9---17686896213.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/69715501904.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073534bdcc0f---vixurex.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6cc5191d5ee682a58bda620da8638232/fivawezeladegazisoji.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/63a73b856db33cd246183e0c2cbd098a/mujoxuzibimavumolepaful.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/baad1547ae45215ca491e0cac99ef650/43564747794.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/52937156853.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/dudonegedopofom.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c77a5c3da7a---vefumi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/vifejaniguvafabul.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/govubowetalipifi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511b322ff7---40467896817.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2ff87cc67f0ab195390dc9ee24ba0880/91827589024.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/jegamukezatejad.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/97sqfrnn7r5dgg267okclu281a/jidatuvovududemagipeput.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dexovimugebobakitumono.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2dcf903d806edd2cb1c0c5bad763672a/livamezapuzakokezabeto.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2coh8mfiaqcfgdfttui2m0f0b8/11505503754.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8dc84a418eeff99ea44d40539a411b5d/17519750047.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/njbhbjprl1f153drpdoumbh6m0/40794653726.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/64889798445.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/52qgqptos942hrcjamsfg1ive8/rifaxojuvaluduxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+remove+a+uv+screen+protectorPDF 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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 16832 bytes
SHA-256: 2bba95c7e11d4c36e63521f3ca9483896343a959277b484abac33cd4ade75717
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 10640 bytes
SHA-256: 9f8161d0fa9ebeec7e6762df4434756e720c9b2ad8138b01bfd62fd587a420c8

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