Malicious PDF — malware analysis report

Static analysis result for SHA-256 839249c80d512d9c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 21:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0dfbcf686bc7e09dd7978d6e02fdbb8e SHA-1: b90b144a8f72a1e87721bdb7ddb0047400636dde SHA-256: 839249c80d512d9c0a8c1b6f0ef835244f9cbea5cfe10e6ccd288977d769b3b0
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The presence of multiple PDF link farm indicators and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b765ef27c11---sufosawumevugumeto.pdf In PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dcf58cd9c4ef08178c61aac889946f2c/zomusuwasuw.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/bulenidivewenukudixoba.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/73191603565.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/faximanewefezonekekix.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/29182407154.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/vexuk.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/vovaveporibotalagubu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b02dcc0f---55350189197.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/jupovoxuwajejemakuboka.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6cdbced7---wetadefunosufuw.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609139b23022c---balupuze.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uteu2qne4hikdjkg0minb07vau/58980291130.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wuzelepuvu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/29956244405.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f9144af0---xonaf.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/91620232034.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/12320766647.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ropitamonutowomamilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=relogio+garmin+forerunner+620+manualPDF 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_off0000bfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB3 10844 bytes
SHA-256: 4602612bd65143c6fedaa6dc57003feea92b64644070c02c00674aa6cb36ed19
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 21836 bytes
SHA-256: e05d488a6dfdc21bd0ac1a500b049b414ef9f5099eae1870e9b86e1454d298c7
font_02_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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