Malicious PDF — malware analysis report

Static analysis result for SHA-256 f653b3c0dbd978fd…

MALICIOUS

PDF

98.7 KB Created: 2021-06-12 14:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6a52025a1e66beec7adb978540554d8d SHA-1: 9424017292ef93d28b55e0f69bc788a452eae902 SHA-256: f653b3c0dbd978fd045b5843af6bbc19a63413d6464bcb85edf64cc60b3f303f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and compromised CMS uploads points to a likely attempt to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nomylo.ru/uplcv?utm_term=lipidos+en+la+industria+alimentaria+pdf PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16099eb2fbc02d---84310394152.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/33c1b1adc4d6575382607c2887f6d2c5/2271220795.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ac0724a2---7692154947.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160740bda9233b---3083638230.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9fb27085---mavafalovuteresobix.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c062a55bd6---xekofigekokewufifi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850b5e56b6---zerixanupelilu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/1613598800.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2bf48a78---dufukefutomuxofonuliv.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160797104ae549---65259983266.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816229a0678---45018218950.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081779d9f0e7---nemomori.pdfIn PDF document text
    • https://cape-electronics.com/media/file/40820435301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 7772 bytes
SHA-256: b6fa7796b573e511c1e615e40e56903e9431a59a599e11dfcf5c2c66c8872786
font_01_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 5128 bytes
SHA-256: c87c5e6a50fbb977884a94d3e16e047452615ea065f348298eb3ccc602e19f43
font_02_sfnt_off00013f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4F 11776 bytes
SHA-256: ff0e3871474b4d263afa381b5fa99a998519ed480fdbc8db0b36df6356401927
font_03_sfnt_off000165e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E1 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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