Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5ec944fe6e70fb…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 09:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e072954fbaaef5bbfdf683e3f31f1d1f SHA-1: 8c47b439718bb7702e3cb83307dfde1dd8d0ac0d SHA-256: ca5ec944fe6e70fbea00a59306bfa7b8dddc1258ee8d682721dbcff1ca78123c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f75e58a46c9---12633106404.pdf In PDF document text
    • http://golfvillageonline.com/userfiles/file/xalodofanazalarekexu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/36728173673.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/94514187979.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tilomumeduritagig.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035c94a1d8---mopomifejudi.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/kukabulofakixepokip.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8efb5ae13---mavowajiwaxukukiva.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2de803e9f---lavanuwezozuwidebudi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f64f34f64---jadipuzodunukexakoge.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/84a004b0d9acba69600d1253b74cb197/22236746268.pdfIn PDF document text
    • https://btegypt.com/file/9267924488.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/42602180308.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wamazuvenelikupu.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/34844282025.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/dc62a061925d76fe2a8831a2a7988780/92354531520.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c86ff127b---dexarilazojagesola.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/tezegupedes.pdfIn PDF document text
    • https://aashianarealty.com/file/torizoxijunimigedabolikuj.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/50177517923.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/h148o70f899vfh0fng42o69ahi/89813314813.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fonalixifudokevumelux.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/9355929318.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9b15519d3---79285411390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=design+and+drawing+of+reinforced+concrete+structuresPDF 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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 10792 bytes
SHA-256: c5f9c4148e8952478a620f4646345a90612f145366d583c871a232888ca43e4d
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16412 bytes
SHA-256: 33b40ce2cb010ebd032eacdbf388963cd677d085c292a01422a39f62f00807ba
font_02_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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