Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e965d2560a70e2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 05:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82d663f370a1ab47547342d1ac278738 SHA-1: 79e2e3d8a9e99c9f0a9c83c23ff104b86cb19c36 SHA-256: 91e965d2560a70e21efd28b723aa175fdc3524acf07441698d12def865a22188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://automyjka.pl/automyjka.pl/userfiles/file/62612833980.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/83435763376.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ff9f13f1---xevuwobized.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5g28dif587mrgvv1iv0s9mv07/92394170037.pdfIn PDF document text
    • http://seamacros.com/upload/file/wizubibopetid.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/17191114102.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/revitogugojan.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/13701629722.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lidije.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/9484559410.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xosowowaritetekafomomete.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/9958218977.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abf916fe---misuzafubadukojolojopa.pdfIn PDF document text
    • https://yasacompany.com/upload/files/muzebotunijoguvutibububo.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/fewelipozifepawovef.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8348ddbbe---17416852103.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/87966788679.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/88024142709.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/76175180542.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/49885521153.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210912103416_1300205742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mirror+screen+to+android+autoPDF 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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 17144 bytes
SHA-256: ea66474c84422b58a2bb74177a6c9bb0898a09cba1a364c955c6451dbfcdace6
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10412 bytes
SHA-256: 2c3d82d91282bd40d89cf7af5c230a8ec9f0eaa06a1d71df3e8794ccd44a0ba8
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1