Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf806b0f67fc0dd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 10:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1365413435cbcd52987281390eb5232 SHA-1: d475668167f1232246b57d8d85081827c9e11383 SHA-256: ccf806b0f67fc0dddf326a3f43f39532c03187a89e9e57c29cf158fe633f790f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of a 'how to get free robux' URL in the feedproxy link suggests a lure for potentially younger audiences.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://asea-admin.com/_userfiles/file/20210617132302.pdf In PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/28576812825.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86322bf55---xofob.pdfIn PDF document text
    • http://marymo.ru/uploads/files/50703139606.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/9nvri3mj1t91mlrk80plcku3mm/webukomefeve.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/55216190354.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161024a865c5b6---41315592537.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qmaerdo7rciknfipmt908am1p4/4207799451.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/11185647395.pdfIn PDF document text
    • http://i-dron.cz/data/file/legotozinusuvumepefutize.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/wikenekulazax.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/xegan.pdfIn PDF document text
    • http://93564497.com/userfiles/9721136872.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r8f2sm8ramfeidrn54ob26kl9r/lofitemopiki.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/13003990195.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbaac5dddf---detitifasuxexebojigil.pdfIn PDF document text
    • http://btfa.tw/upload/files/67805572108.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mokulawakemiwilezusaguj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef07df1919---99020921119.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160950d1f037a2---40852927967.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3865fd028d---duvijikepigevevifudoro.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/69108955825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+free+robux+1+millionPDF 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_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 18356 bytes
SHA-256: 522ba1dff70f89a5a70dd8c715f1dda5c1765f138de5eb228af77ca32df3641f
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10700 bytes
SHA-256: 52180c6569ae7d669a7955fee3e724168b9c13c3875b680a1c2975a5b7d9f578

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