Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd5929da497e82e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 08:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d45c39e06c445fd9f0023a5a12da124a SHA-1: c839c984f302a4a72644f58b6e43716c05f544d6 SHA-256: efd5929da497e82e9231f102043f147c31dddcc6b1104908e2aee11ccc43e27f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fqi1vlkeqd3g9i69lqhin2akp5/dosalozopugokarogifepe.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/i9u90teuml6s827r97834u5u43/bafikuzaposanaxapuneg.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xulutotugo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/68e8958e0d2dc0c449f2852c2988dd15/97445798766.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/wuzoxovibawuz.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7bba024df49b4fc7fd3b29d74881e03a/vejalozafepozelurewizub.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jopiniwaromidojepage.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3ef32e12---mosuroregerumapes.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6391cbd95---sivoxasulosesame.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/42120915319.pdfIn PDF document text
    • https://eternalbliss.net/file/fabasivitavipufozokemiv.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/55297610897.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/77963716083811cd253d37627e4f3fd0/22407411316.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/kebizefadelavix.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/53229699195.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bf6d44dc---80774279350.pdfIn PDF document text
    • https://aashianarealty.com/file/zajenomarebipuxelu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/655b8695433b1a80f19c0ce556decb34/kuzexoraleruta.pdfIn PDF document text
    • http://houselandia.ru/files/87880382887.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bb38ac03517029e8c7aa41ce084cda0a/4624749851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=someone+you+loved+piano+music+free+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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 11036 bytes
SHA-256: eee0187f0cbe99fecbfdf3308681ab6729af97183da3dbb5470d9d2ac54a6e37
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 18720 bytes
SHA-256: e36285c1a7b026b4817d0e9635b0dc7e279a44095857b1dd57028daeb2df50ab
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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