Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dfddb8a0bce816…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 03:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2254cedc933683c4cff08429b10b8c61 SHA-1: 3543c7c08473a3256a0a89538b04ed6e4f468720 SHA-256: b2dfddb8a0bce816c53e644ad41f107718408e7e4e5eaff52bf2b4c397e53f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the URLs suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rj1e5dndn6r49rcl2q2fmeorip/dulirevofebigivibanap.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/h9gt76o8espd7832lkuei00f95/37435754558.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd902c6c391---83300551990.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd34158bf1---58382648631.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/40351652298.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/35468438006.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/68213818951.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/14064263999.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378c477f61---taxifanoxidasizur.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vigidunadebuvokisobeti.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/ziwovipugakif.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6fd308abd---mamifovane.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/40877358601.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0a4382477b927ce7734244bdb09e7474/38273612128.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901192212475131.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b1f67d8552b65f8f9b6261e71a6a7c30/41716271426.pdfIn PDF document text
    • https://argumentua.com/i/file/57561642163.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/bawasulasiwoxepavu.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/55627964320.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84747ee68---ximapusaxizitizibegos.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/repibamafejogeforerenode.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/titebanek.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/70978859558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=deck+the+halls+jazz+piano+sheet+music+pdfPDF 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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 11168 bytes
SHA-256: b72d0a6b5940b77bc3def06c31fe7a2181229a8a40be12342061d0500da6bf9a
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 18560 bytes
SHA-256: 6c61691f69a524665760254ac45fb6756e6d92e67a0eb3fd80a1b548eb56c9f2

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