Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b5e090bfead8f3…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 05:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: afaef9599b9a94f7d8cc0ca3adff489d SHA-1: 7e38db407fcd0f5011b9300eb479927f4b6adc06 SHA-256: 24b5e090bfead8f36dc818020f87beb1c441d6a990e4e1e83c3445ad3991faa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=all+the+mythic+guns+in+fortnite PDF link annotation
    • http://hk-bbc.com/upload/file/84103446118.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xarotavanekip.pdfIn PDF document text
    • http://hjhchem.com/upload/files/73364964584.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/nigasekutilojezomumeke.pdfIn PDF document text
    • http://krzeptowski.pl/file/70745254319.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/47904422879.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903060050.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f4f1128c---11758616976.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/joderarejepenage.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/80122625990.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/36483347393.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/43562432672.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/gonigizofetopewigivusib.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ratimalid.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/82b19c0a3dd8a187d304d5b291e34955/54914051192.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/birejugezifatug.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480bf42a8d0---lemumolemarurol.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/43638582764.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/79559782331.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12383518878.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/37908413418.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/raviwapevisevimefew.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/14474809932.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/palega.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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 10816 bytes
SHA-256: d68c2b21d045b80e382246656be10acc5b91ce0668946948f014b907e05e59f3
font_01_sfnt_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 18280 bytes
SHA-256: 2c58f475e4231a4b296adffaa64170384cdf8b176bac85c90346a4d365f6e5a0
font_02_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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