Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9811804fb2be7e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 07:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a342caed4cedc55ee50d78dcb228cf29 SHA-1: 76a1cb3db3d52bc1b63f4122d62fb7146cc0ee00 SHA-256: 2a9811804fb2be7e30378da4950b582ceaa56524f60e27af08e8d50fd2a8bb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to potentially compromised WordPress upload directories and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cebrigantina.com/025-CEB/images-editor/file/49165317922.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/tu66678el7kc99agnk4tmdn470/28976886663.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/suzaki.pdfIn PDF document text
    • https://aspirans.com/files/file/gibirurusurakixobuz.pdfIn PDF document text
    • http://lidata.eu/files/sukogepasirezufotetopi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/20347475137.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/020addc006c432b3fbec95e7a99b80de/vibubesusigodasurebupa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/df68f666929b7b2da85fdb838d3aacf4/mepoxeviz.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/280dbdad01f87e25364285208e0e7f66/fagazavuwubujutexepax.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9e9f7e7a6---56492782322.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/buxetepiwufova.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d62a14f8---79572285029.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fajaxigujutazanurigebave.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/39451968925.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/2f3abd3a3324d923a548854b0514c99d/65066274918.pdfIn PDF document text
    • http://etnorom.hu/pictures/13276986210.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/32165325029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d015a761719---30220826731.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/503934706.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/tafep.pdfIn PDF document text
    • http://hncastlecable.com/d/files/12531310810.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uqi1um8o0nlg4adnte3q49167q/vovatojetutuzipilofegujaz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec86a94d4---nomofelojabiful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=alimentacion+en+la+epoca+prehispanica+pdfPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10868 bytes
SHA-256: b5a96642c655794249e5b44c495ab23aa9e8b4575b82774366731df09846c3ed
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 19040 bytes
SHA-256: ce7af2b54ebde23b06b9ab25855a376f4d02a81d7d536a3fd459107569f6b474