Malicious PDF — malware analysis report

Static analysis result for SHA-256 4927bd869dd316d1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 13:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ab44cb9641b60e3785b38038ce85ed7 SHA-1: 5f8fc2c1981edbcf53c59afb29dbdeabdb27c138 SHA-256: 4927bd869dd316d119ec4bea38aa3724dd739227e208a75baf0c4a10fafb47e9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The file contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://saxonrt.hu/img/userfiles/files/jafizakazalokadekerada.pdf In PDF document text
    • http://sevoir.hu/uploads/file/80292162527.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/73841094348.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/togigi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/43371963931.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/21bc61f813f4b58aa7a41ee4e20e7db4/rebafonevanuw.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/81630605688.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161394446c31a9---26690264806.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/fomolofuzawagidusuk.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/34573425627.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/83cdklgmppel9mnt9s5jpsp6h5/nelowozulafifatezarokibaw.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/27336451016.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51ea170a---29840711309.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/88973499061.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/talulidalawasepoju.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/tuvubuzikukoti.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/72876671380.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0ho3qvmnlckt81fp0g9ufa7du7/nusufufiziw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6ff48cc0f7e96277709ea6fa47ac415b/zoxapexifuvakapuzulomumus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b57317df---winowufuxepunopofiligasom.pdfIn PDF document text
    • http://watch62.ru/files/files/9846973682.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2a1ebf88fd2162dff558961a93de2e77/duwimonureji.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/rivixupefum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+1+space+flight+simulatorPDF 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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 11200 bytes
SHA-256: 15c675dd01dcf0b189cc0fe0053a92ef6332b79065da689b6fa4d4df3512ca25
font_02_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16772 bytes
SHA-256: 6daee4e9f67ef8641f006ef5f47dc4086823a5bc52064691be8b5cb74763deac

Open this report in the interactive analyzer, or submit your own file for analysis.