Malicious PDF — malware analysis report

Static analysis result for SHA-256 755394c46107776e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 13:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3684367a740dc1f5edb348a45f2c00fd SHA-1: 612ab0ceb3594f25d6669eaa25845f73f1fa16c6 SHA-256: 755394c46107776e0d386496eb69ca8b82210147de3f74cc0491b9b1efec6a40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those pointing to compromised WordPress uploads and disposable hosting, suggest a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of multiple external links strongly implies an attempt to redirect the user to malicious sites.

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://huntic.ru/uplcv?utm_term=hack+game+app+download+for+android PDF link annotation
    • https://multimetrics.com/ckfinder/userfiles/files/4678650279.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e6a820b1---72808171195.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nrg57hdk7j32jqrde6u24e1m75/wamanixubele.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630885878.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/33947161978.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908123624461.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/pezorafomupekejav.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/33596927001.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/6659907483.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/67223609998.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210914164917.pdfIn PDF document text
    • http://otczenacts.com/media/files/gorakej.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/fenonizavunovi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5fab7d7e---14184530877.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/82611284344.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xosibogezuzumutop.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/86025978295.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wujulap.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/fajosawevusoxame.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/tajavavasaduvolu.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/dotovobevagupomed.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/girerupodiwitil.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/40220722204.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50200956696.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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17400 bytes
SHA-256: 721324b13d381d4bf1d8a340e9436ec11489e7607f11db77dbf0b9935c0cef31
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10868 bytes
SHA-256: 2f792629f10cdb0a22b454e8be2ad64ae2e9e2a7637e7eb17bc6d879e6ed9f2e
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1