Malicious PDF — malware analysis report

Static analysis result for SHA-256 601a4973c5a6f7a4…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 02:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60533baa650d48652cc2a9f7bc3e6438 SHA-1: 29954b8fc4e5b7fd3acbc534194332218982a246 SHA-256: 601a4973c5a6f7a471f9d2561668c6734ffc371b5d9cba8f1db23a1ed3eb6eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URI heuristics and the overall structure indicate an attempt to leverage these links for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=ipcc+indirect+tax+notes+pdf+for+may+2018 PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/93c219eb29feafccf2aa5aab11c306f6/49659257988.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/79687713298.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/62855785279.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/05458d195391d3d0f7fee0297a21b4b6/30661649513.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/felilu.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/tejan.pdfIn PDF document text
    • http://abnicum.com/files/file/40095286407.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25976391541.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/70330405268.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/favujepimenogupeforeje.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadb77ab1d---28446557496.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/kesurumewux.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/samaxe.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/54819862968.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/woraxu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/uuufuoonke54i9o2lvi6m304f7/kanusapetasadasowuxopi.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/62665940765.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07dbbe4c19---dadujom.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/vizusuf.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/85071762654.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac266802106---92188072451.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/etn5dodv40228hg6e79u6r1sm3/daguzo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609739f3d080d---47356918178.pdfIn PDF document text
    • 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 17724 bytes
SHA-256: e8de4ea044e30509e147569bace037a1a1d51e31800052384ec9f2d88ba0bf28
font_02_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 11404 bytes
SHA-256: bd7d7e1a74f5db1148abc9bdadbaef5540e81d822317b8f32a9fba5bc9c1dbfa

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