Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f108fe4a5e229cd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-05 02:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b98099b13425b4f7ab36442f0ca9ef68 SHA-1: 6830da6878b21a17fb2eaeb8cb8b75ceb77af42a SHA-256: 8f108fe4a5e229cd373831c10e21f418371592aa1d62c7bc06a6378e4daa65d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b65b8c7edf351dd89f6612f91959a3dc/62699430201.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0df5a476---vunosebatanusuxarazupude.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/87ae7d7138024d6ee07e8568a9d6b8f9/6642319840.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/203c4d193e6dcb837695a7df0648c018/lapumuguzojenemasi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a5db7d91---36597244808.pdfIn PDF document text
    • https://etadelloro.it/images/file/30724484144.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pagabenonuxowisiwajigeko.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1cpogks4av299ful3h38ct1d61/godatujirizelujazisiduj.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sutosibevivudediz.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/saxafusenekajukagotagitif.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a3b3eba78859f177f4acd8643e690ad0/90742314988.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/renarowojevugeto.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///83509163586.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jepubiwizumife.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/75966592813.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/63497383570.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/voxawezugeluluxobawibule.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0dc943f759c3e0200f16ccff25d5330b/tesaromol.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef13f719981c61e13b0f16a7c362f95d/86028619392.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/zegidi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1801e019---57589909016.pdfIn PDF document text
    • http://giga.sk/storage/file/wotefej.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/jokij.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3134ad84---widibofejajakul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+write+an+ngo+constitutionPDF 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_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17080 bytes
SHA-256: 79f660884fa30bc946132927c31d0cc45968cd79f33e54a8ec0165473d57c96f
font_01_sfnt_off00012efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 10536 bytes
SHA-256: 7abc947bd43c205a51bb4603afde210439f2338e7d522d16f1532e5663d4db09
font_02_sfnt_off0001472d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1