Malicious PDF — malware analysis report

Static analysis result for SHA-256 895df98ca54b51ec…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 07:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7626dfa8156d5497abb300e14ba16419 SHA-1: fdfc889b2c396f0c2070eadf8c39f2b066423be7 SHA-256: 895df98ca54b51ec670471a1db91c59cfd92e6f6cec4ecc6b17bdf88d1875380
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Multiple heuristics indicate the presence of external URIs and link farms pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=manual+aluminium+tube+crimping+machine PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa43cd982a---33727791870.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/49258983835.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/wutodemokodanajarafib.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7eb512a75---mijisabaw.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/79662031341.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/12072340341.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34060ac4f2---xesopobopazunepalax.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/bebopojededa.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/rajanim.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b41156955ae08ff252f66ec80974f650/46773353756.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2b71a3e22eec6d2857092b73c269e309/mavezatit.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/2939030012.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7655bc80---67216091028.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/5706413074.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd90e08ab3---misiwekikukilubovej.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/jubebolav.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/dfc2d424b1090aba782acac3bbf47680/gopagabetod.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/97200109170.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050609594873499.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3bb5a1f522e83238b6e5c52177f2d688/30256461274.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d139d014---pinuwutonapofasif.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/morivapedozogawevubu.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210619193014_85jl07.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kukopatuxikenumobebo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160968bca13175---54869219527.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/batumejujusesesibutabili.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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 10764 bytes
SHA-256: 8e75bb1309817945dab542e54de714bcadf3adfd106edca24efde37b0215db48
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 17952 bytes
SHA-256: 2db8c95b48d7489ba0660949f745a07d059cafa6eb141158544559589fbf759b
font_02_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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