Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ce24f620613c95…

MALICIOUS

PDF

87.4 KB Created: 2021-09-14 13:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e92fb433f43617eb36a86b12ec9155c5 SHA-1: 590b6098429023f9ee964718d274d7a5ba4e2947 SHA-256: 95ce24f620613c959efd88af4bab6ef7ab8dc057a3455249175f8ec064f6cdc8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term_redirector=True' further supports the redirection aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://anhbanglaw.com/userfiles/file/53177990114.pdf In PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jivavuxuvewa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c15029af---wavixatumog.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/25706854018.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56259193590.pdfIn PDF document text
    • https://umutfm.com/resimler/files/25414912594.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/84923555114.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4eb23d77375bb2e277c1f4b40da10349/loxiwodovosetoj.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/96704566341.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/tufirusopoto.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zutuvuxovosex.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tajudafigugegutetukep.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/gotezatusebu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f530ebea---jimapo.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/83079322771.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gulipanuvaxuvumavi.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xipaziwawinobidoz.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/mazerideselakarozuwupe.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/69140431712.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45868602545.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/11639407936.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/dozem.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/61563558481.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/73244839208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fear+the+walking+dead+season+3+episode+13PDF 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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 18616 bytes
SHA-256: f1448a8da8884232fd825f1ba44193a19bc0d62947e75e259a2dc6e7a66bf889
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 11052 bytes
SHA-256: bce7be3de46f7765524e8e8d1415e895e2b80d55d08bb76c8926516211a60a6c