Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e83573596ecc8e1…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 02:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17962e6041ffa1c24ac38fca6d050c06 SHA-1: 19655f406bac89881d32e2d7f9f6962b35465125 SHA-256: 9e83573596ecc8e13fd6a8dd2254523d88c13d931145b1a3c12fc41bd5624eb3
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_REPEATED_PAYLOAD_LINK_LURE' indicates that these links are intended to deliver a payload. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further suggests a lure to download content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30d78a6bb---jumisirugewedo.pdf In PDF document text
    • http://shiokuda1.com/contents//files/29884464956.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2d5f6f96c4d0151b15c3185254e885b/43980506039.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/9773505170.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/vabuzukoxotimugu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/78244884138.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/36711458842.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ma40ej5d4l06rdake8b0uppk1d/delapuwosawobarut.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/65177104256.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/tiliravelilagovirugavum.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec62a0b534---69314700294.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xasoro.pdfIn PDF document text
    • https://auto826.com/uploads/files/gitefapovefekasade.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bd53e94d---46038177515.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/sarulaxatudekabokidov.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e615d9e46---vonerevevogo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb730a5fb09---67367302818.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf53e2af27---valowakoguku.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/26841441315.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf264b62f---votin.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a525fd3d43---wigufapexokobuwugisu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71191e627---70198627868.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/figabulukazefujolepi.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/vedefogumu.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/dedoxabelelavakosuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamil+dubbed+movies+madras+rockers.comIn 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_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 17788 bytes
SHA-256: 4d0fe9ceb6373f5701a88148d0ee54f113137e8f38200d64faae93963df28da5
font_01_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 10756 bytes
SHA-256: 4295b5c75a08d7d6636ea1d134dee2e134ffc8f428ad8c6056fff580cb1aed8d

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