Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2436b9fb0005234…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 20:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 649e3af76690f6bf630e060aca383dbb SHA-1: 3bcaef48bd8653c785241e0cb3c4004d8d9365ab SHA-256: e2436b9fb0005234d239ea5061510afb47fccd6b9c6d67f96ebfb5b88bd9ef0f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, including those hosted on WordPress upload storage. The primary goal appears to be directing users to external, untrusted resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mosconi.net/userfiles/file/70770614664.pdf In PDF document text
    • https://kovosluzba-praha.cz/res/file/rufojule.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/89979030945.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b84861df88a---jatupobo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sekigabodusafikokel.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e94777a2f---miratovututibolunurux.pdfIn PDF document text
    • http://ibb-online.ru/f/file/ruzipekopejubipo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c76151e7c303dfe944ad80125a4b395d/70581576423.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/wabemosatuxuvajumu.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/romon.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/bawurowibifewodorixe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19adb82ab1---5629625148.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47eb3ce6a---69996638896.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9b33349e---70278442176.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc45f2b840663da046570f0e6af59026/pekego.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/65213990168.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/50960677241.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b10565203fb---51640969502.pdfIn PDF document text
    • http://berbun.com/user_img/file/49217794816.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbbcce07c---vulixawimaba.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609349982cb56---rogiwidapafasobalafe.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f3e45b4dde5d80723809baf97ccb8c10/besazisitexomolavolu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gemogob.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/276565162608a43f8382a6.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/91569146944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+last+wish+read+online+freePDF 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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 10500 bytes
SHA-256: ef2af867f67f2145224cb886ad9e7c56afb353ec79f959c85e90893db7375aee
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 17232 bytes
SHA-256: 2c438efd426ee3d7ae9e86d3ebcbb920dfd39b77cbc9451d0ba8115dde070998

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