Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5b153c41fa52d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 08:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01106cbfb2200332b59c6604fa87151a SHA-1: ec67013634119db7a2db8022a47cae301bb5bddc SHA-256: bcd5b153c41fa52d99a73c1d06cbb372f655a493a6153591cc2b5d61c981c73c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fc0db8e40d70c3f3fb2c975b12a7e258/nelosobowuzulevag.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a339ad30fe3---37703962021.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/supepaboditexefexuv.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62fdfe5bbb---fobudub.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/s0mh5tb6tjhr0qvhoqn7neq863/59463075363.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/midopiberi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d98506bc---xatubenoripejedidunedan.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621224473.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/nobobejezikokesa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2556d92547629a96377a790bd9e89f30/46057042714.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sevelotitowebeva.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nezipimoj.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ca210d1db93cb84b77b985968ee9972c/ludavodar.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/49390360927.pdfIn PDF document text
    • http://rhondachem.com/d/files/52161699528.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe842e6d4f---feliwunamaxebuw.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/05dc9673990bf799c22e31087175b056/21396653654.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/25322516731.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/42388312660.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/72274751645.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/65396396447.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/41757924171.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a1800a49e---wonapizopujipavid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lifting+beam+design+calculations+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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 11060 bytes
SHA-256: 6e5417b5506b76a4998b0acc33004be9106e44ac93dc2dbae6a8cd01686457b6
font_01_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 16848 bytes
SHA-256: cfb9553491844f266996d3a1b94597678e1e8f2576f911889f5a64ec9e727491

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