Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c5294d71e7b687…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 09:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6e66651a88bb08a87ded6a547cdc456 SHA-1: 441f1666e5c54688c82e0dbd6f256625526e3fd7 SHA-256: 83c5294d71e7b68750594fb6e731e62516b05a16b4bbeb423190598eba3ea0de
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload directories, suggesting a distribution or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dreamwith.gni.kr/ckupload/files/nuxelozorozub.pdf In PDF document text
    • http://tuanlongland.com/upload/files/pekos.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/parimadule.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/ginizulix.pdfIn PDF document text
    • http://thevalleytrader.com/files/70428421596.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/juzidufesodigelunu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210918082949.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dofirelupikupaxorezanafod.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49051318606.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pugetajonofefafuzupuz.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461a7de5208---tosuleribibegugu.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/lematigokixusunexigalazep.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/98449990925.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/91881912070.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/33861405328.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b1e5c3b3---lonewigezapilineleta.pdfIn PDF document text
    • http://minipit.com/data/files/sevavoxapefox.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/46734713575.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acedfa881e---luwisosudenunepobev.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35a2857a3---lojagekuxojezusawijer.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/31517816475.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/35221537650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=javascript+generate+qrPDF 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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 10584 bytes
SHA-256: ff48a65e7d56fff1b0c2cb59c945e70f4c7f0ab1d9a5313f1fac6fb01a43710b
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 17176 bytes
SHA-256: 9bbdb4a8927528c2436905caf3859004e88c414bd30d427411bbd94088d7471a
font_02_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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