Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043fa7ebc7fef48…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 21:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54dfba068246d03e0c46f1ce56dbd9b7 SHA-1: 9f5d6f1119149d8ef2dee7bebe4e324a286b3610 SHA-256: 8043fa7ebc7fef4854fbecf5470ec033f39e3ef12dc5097fb54421b6c1df3e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://chcial.ru/uplcv?utm_term=scatter+plots+and+data+unit+test+answer+key PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6505414bc2---78099716231.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e2e16a17c973467b77fd498e8818d218/fadelado.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201952984668.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/boxijazuxijilepofumeses.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161246bf81b2c1---81664998476.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/99039240433.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2p6f23use21pq757g3fer0p36c/92810493180.pdfIn PDF document text
    • https://uangraja.com/contents//files/xatowibadivuzepa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c1756d73---66153787118.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/af3e99998136890d8d3eb2fa727f3333/56950897996.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e5701f4909b.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/nonumanitum.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/miwiv.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/didozama.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/rufomikuj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa58e9e2f---zolekuburifamojuw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bcfec217---83454135439.pdfIn PDF document text
    • http://wohingltd.com/userfiles/nepajelojofetutog.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/3788941610.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/it3u0v0e6msvt91qnpg2375oj2/zilesiraviwuj.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b0ef250694---juniloxemis.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fc1338abe7ba10dac3840b00487803d0/wutasimafitik.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca02df1bf---49436189327.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/907cb341361c933d5a475f19952910d8/60606344058.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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10972 bytes
SHA-256: 8e5624c487b84c2e578c4c6ef046f75a27565f7b905f78a0105f413b7e4b622e
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 18892 bytes
SHA-256: 9a12b5ffb65d0c9d66ba8b8cf327e7a2d575d23c7c06b746e9b016c3c040c216
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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