Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa6c8ea9dc7da9a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 15:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9dfa0633e648d851da1266214689f88 SHA-1: 0e0009ff7bd989d5b9c96e8a56ae56af6532f6ae SHA-256: 6aa6c8ea9dc7da9a81b92164c28073ccd2b01dd2c38a92f977fbf48163b366c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, forming a link farm hosted on various domains, some of which appear to be compromised WordPress sites. The presence of these links suggests the PDF is designed to redirect users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=adrenal+cortex+hormone+pdf PDF link annotation
    • http://cocoal.com/uploads/file/nukuluwikuvolikafoniw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749eac696c4---82734675603.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/17555548354.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4hs9sb08ea6ihk62u3agonlg8a/bopexonosodofibinat.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/kimesaxebeji.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210614145705.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jivegurogimirumisafe.pdfIn PDF document text
    • https://mszukam.pl/dat//file/5286879986.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zosefujazewaverifabelavu.pdfIn PDF document text
    • https://actorconseil.com/files/file/17058511394.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/65980964666.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2ee25745d4df693a5eec0cb9b79267ce/56924025808.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/26k3uo8qmi4scdtcbhcg9pegg3/raxasesozetoj.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16103e5b77c6ba---dapozozigotenobowi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67e05e30e---17144644324.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f18b41bf8---4705690680.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/nowexagota.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/wekigukawazibanetu.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/90140225465.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/reranav.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/20437111711.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624d7f3b2e---ladixijopexi.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/93002466812.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/pezidovobuwapa.pdfIn PDF document text
    • 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16928 bytes
SHA-256: 5697a1ce53a7914a56cd99b4aea54bdc464c695fb387f5e1bcf1f0ef6484f649
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10708 bytes
SHA-256: 5406b74d42c7e72f6b98afd091918e501a87b4e600b96b6fdfcd6c5921dfe019
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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