Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4f9477b687fc7f…

MALICIOUS

PDF

114.4 KB Created: 2021-07-15 12:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 091787d1ea97d15e71da311ca3b58fbd SHA-1: 797f48a7985bc38fb8dd8776688cf45d31a89a57 SHA-256: 2d4f9477b687fc7fbb0fe91c48bf264b722fcf75b68b91cdb93c73681a6d3bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e64e42b2d---nilunavebosewuluwupegele.pdf In PDF document text
    • http://chinasoftcore.com/userfiles/file///figanabisoxikive.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/45e2c61e44628f027a9a96cfcd2271af/92170665861.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/jupojudemiforelumesadu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59065b56c---82047463197.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/217d226a819877672a437168dc5a59cc/82436426502.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vemufeb.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ca8522c9dd6e8164d4e18eb5a805f19/ligekazedawe.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4toj8tg0bhhi0gpk15ihl3v1nr/dibisobumaluxifuxe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9c305f7dec939195e90a7bc0d9103b2/83063247003.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60E69E89EF8CE.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f17d5fb17---terinarawupubegiwusolam.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/86143030795.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/t41f45d08i966c5omudvirqga5/47840777604.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda4612710---posigurewusix.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b780596ef26---kurawojipoz.pdfIn PDF document text
    • https://ivanamihic.com//files/36142276010.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/947808309ca1483d56e98317becc8945/78429223930.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9f5d60b3eea5ea22bd207eba3ede2570/gifipenikaganozezojarawe.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/bubenap.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/beab5f70a9360f4463c66218a1500e9f/59486397335.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210529221737.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/wuxaroravesufofidej.pdfIn PDF document text
    • http://akademibt.com/resimler/files/92670979369.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/bc7a92752258eabc44ed528d687379fc/katomokigegubexomobem.pdfIn PDF document text
    • https://akemi.ro/hirek/file/rozazapasibarulikukoxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+spontaneity+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017951.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17951 22040 bytes
SHA-256: d9fae6c874bb90353d280430d8620baec42ffd46c83dbcca6ce3b6be50ea22a9
font_00_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 31016 bytes
SHA-256: 092d85d8d62aba80e13ed91a0508397f726d039d4f6775cd4a7439a6745cd6be
font_01_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 10644 bytes
SHA-256: b0954544ccf8c3916f4c2864c004470db5dffe083db6d2a9ebbb5baa7fe74499
font_02_sfnt_off00016396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16396 6272 bytes
SHA-256: 2dcbfbfb2e7aca6f1a7c78682e0ea9bfc3f37dab1210e0cba1f24087fe2153f3
font_04_sfnt_off0001a160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1