Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce37a381484d977…

MALICIOUS

PDF

92.4 KB Created: 2021-10-06 08:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9e42bb6ca311f98c7e79c02fed9a089 SHA-1: b2ae4a2324c4e692f8a8a384d0fc339e116714a7 SHA-256: fce37a381484d97737be8353b7ec95a3a7649bab00808561e8d28d31a79765ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://restokrat.info/userfiles/file/6463337517.pdf In PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wireripenevofuxaxuvogagu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/81g044u4up65lftiste48ibic2/wegom.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/48117780393.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/viruxuzabi.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/71376201318.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/keregufikifavul.pdfIn PDF document text
    • https://bdata.vn/upload/files/sajufugovokafuzonalimil.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/bosakefogisaxusajib.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615424e7a56ab---99288066535.pdfIn PDF document text
    • https://flyags.com/editorResources/file///noxozomogukeridowezet.pdfIn PDF document text
    • http://15881588.com/ckupload/files/maragejanotazuwalix.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/68334285446.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3a9138f75---56720599167.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/fagulagofufitofipujaxit.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/5722150435.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631614063.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c33b4c30726c53d728d7fedb158bc661/10251254732.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dagojaromixu.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/kesuvobalozogos.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/vibasuwiruzenivexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chapter+1+science+class+10+testPDF 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_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10556 bytes
SHA-256: 7df11408df0391fc837bf8e899aba3ab9f2372ff146ed8a68d997fda073a9c90
font_02_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 18140 bytes
SHA-256: f214bbb6ee2b7bfa66030ecb3be5bbb60042b6ec8d7700c8c10e80b5f0895aca