Malicious PDF — malware analysis report

Static analysis result for SHA-256 956a70b4d556221b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 16:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b770f6d98f7100349a8ac58dedcad2e SHA-1: 750607bbdcb89ac9de4abe7a981c37a3aa3cdb20 SHA-256: 956a70b4d556221b62b9414a7d957348ba6db0d20c58c47d6b8dd8eb76767bba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=amazon+prime+video+free+mod+apk PDF link annotation
    • https://autosaloncenter.com/uploads/file/xarabusobizabevifimu.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/finamutuviwimodub.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/pebebusobugunerapoxe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/pelumewepepebigifaga.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6a95dfda---6716607396.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/baletumuxogozarazunalexo.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/bovomusukusaxunukenorifok.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/pazopifage.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/85069013212.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/21697919992.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/41553474045.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ebd7b40ae6e51598356b773a67bf5c8c/wodotategojuderib.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/20199540259.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zubifolenefojomo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/9878311679.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/10483039908.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/14481575100.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/33596555475.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/sibipawezizilinaveneleza.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/mavutik.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/39584919604.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bddb0c7c---pexupunu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210903234830_1892198395.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_off0000b453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 15300 bytes
SHA-256: 890a98b6e13777b7182d9c76bc5d7381e15f4c3c460764d7494c77d01c6c126e
font_01_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 10548 bytes
SHA-256: 15a73d86120f9786c3472171d78bf9fcbaec211879a55e28d42951531b0f8baa
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1