Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7573dce1c3e1f7c…

MALICIOUS

PDF

111.6 KB Created: 2021-07-26 01:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b78e189e2154496418d6a760efe1d7f6 SHA-1: c9b22ca32d35897891b5278b7aaf9f65e5aa7989 SHA-256: b7573dce1c3e1f7cd172fdbabc71ff71cf348d46d9ea3e29882625b260638d98
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://sibservis.com/ckfinder/userfiles/files/melubabibepe.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb16f33294---volararepabejolire.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/petodupekatogoka.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210530165300.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/rixisidumufabezizaw.pdfIn PDF document text
    • http://abwva.com/uploads/files/16072368722.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c10866e2494---71241999401.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ecea05ef---19352230525.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/domefajejafisalige.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fa4iklue5j8up764hk4qvmrp55/vatofumemufitej.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/futizawi.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/60217886660.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/rigedomamexemoj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb166e690f---33184671570.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a566a94ff017ec0e62f27399d6aa1782/ragadawif.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/tedigusonowopawolojobevu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e452ee0d9ac83a41c63421363a9ab9af/81080630620.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/47807891062.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ce862137030---18340972137.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd36348dd8---kekutaletogozolum.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/kowimevirewawukag.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/44ed2b24a9264de639d32ca5adc78be7/xoxowaxifavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=verint+impact+360+recorder+installation+guidePDF 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_off000150bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BF 11388 bytes
SHA-256: 11ea9643a1cf9ae7435e7582b4cb6eb9fbbfc0d8c88b233bb4acc907674f9d4f
font_01_sfnt_off00016b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B54 16868 bytes
SHA-256: 00e302897742b39d28bb74c031e2fdb6f0f0ef8e2ed4519a12ead3d9cc3a4f3b
font_02_sfnt_off0001974d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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