Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cd566330cb2234…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 03:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4a354a2781fa48f147f36d5c268afab SHA-1: d41213b97178addb1d27abe54aa8b4c9268d0e39 SHA-256: f0cd566330cb2234d379958cc3fd92db6f6cb06cd88ae214be6193aa22b7d798
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to disposable hosting, indicating an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nanyangtextile.com/userfiles/file/kovali.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d1733b3abeef6f6811ac4703b3e8a21e/futafilugejilutogasemodi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d9626cedc0cbef897bf52a5fab3a97f/46246252042.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/lagidigufoxolalak.pdfIn PDF document text
    • https://airbays.com/userfiles/file/84569683376.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9ba062c52e5326d9971888d134f79b6e/zexixativijodozonog.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/67948006181.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b3292ff727c5312dd1daa09d3bfbccce/49261715195.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/28367002275.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/bedijawumakuwono.pdfIn PDF document text
    • http://toonesk.com/upload/40866581931.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bd4494deb21c2e2ace3e27ab202f6b0f/jagemumavokum.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e149bb53---4539348978.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/taklnruimjtptbogqq8dp4a211/73601603535.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tadetobuvumizegil.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/42161397773.pdfIn PDF document text
    • http://djpress.pl/Image/files/27870469666.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/624dbb7f459c92dbc6fe02855d59d261/15691724539.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/65234603016.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/sitivedidiwozopakifan.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f208544a---xefepoxeka.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e7401ef4---xogedirimonezozig.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddeb4533aa---sejomasasixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grade+12+physical+science+study+notes+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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 11140 bytes
SHA-256: 3c859d5dfcb93e87ecccb6fa729211bf10860907e059e961d66b6c5a6b5aa9a6
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 17860 bytes
SHA-256: e35d1672784cc7158dcc9b05ac84feb1d8a397eac8193fd65b431ecd1eb8d7b9

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