Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8dd94f278dd3e5…

MALICIOUS

PDF

78.3 KB Created: 2021-10-18 05:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 890178067e749583e5793a0dab015de9 SHA-1: 3378fd485fcece8f5cd8d86a04426db4bdd3b744 SHA-256: dd8dd94f278dd3e513ad0508f5007ef8d3cc219309ac6d397f437e0ad4339082
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=higher+engineering+mathematics+by+dr+bs+grewal PDF link annotation
    • http://spostojow.pl/userfiles/file/73412935538.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/28879232498.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210923165807588.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fidemafulojo.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/89314899448.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fonetijapinifirewuwanin.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/duvuguvadepi.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/60279709825.pdfIn PDF document text
    • http://consade.com/userfiles/file/35451869650.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70904487609.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159090b0f236---pewefogama.pdfIn PDF document text
    • https://askisan.daynexdemo.tk/upload/files/duzusibafatojububivazives.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/lemizupevozu.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/viwovasib.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413bc401a8d---nalitonudepagesozitu.pdfIn PDF document text
    • http://www.pilartangguh.com/file/38232102122.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156ecca67b01---zarulitawakamagowimilez.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/54679315002.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f72c01143b---28669847618.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/dajubotisoxuloki.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1615b51cbcc908---9292933671.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/pisupuzuva.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/7764319587.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/suxiw.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 11028 bytes
SHA-256: 429441c22aca398e624570c1b0086520cbcd66d1969ce9777ad28fe6382f1fdf
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 18180 bytes
SHA-256: 7dc6d79f1d350c45b7cf1943ac1cd892e724d4bce78a8e5c8dd9913ddcc8c1c0
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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