Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef510fce59bebc7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c1eb3883e857ff809cf3ee0359134590 SHA-1: da9ab94c9ea66bd63c6ea5b496349270bda13735 SHA-256: 7ef510fce59bebc74ad66c3df762c9e15c9a5e763cc421b3a4a7a8049ca6410d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised WordPress sites, forming a link farm. These links likely lead to further malicious content or phishing pages. The presence of embedded JavaScript, flagged by heuristics, suggests the PDF is designed to execute malicious code, potentially to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://crysiq.ru/uplcv?utm_term=mellerware+ice+maker+manual PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2ab5889f---rifubenagunejifuvakis.pdfIn PDF document text
    • http://rilta.net/userfiles/files/rizirozejovumib.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/40194997720.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/12895944252.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/dadotu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160700838283b0---jivipabavi.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/93939613039.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/922765356.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/giduvi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d7a6be77571445ac4c30cc56e2591409/melaxelowuwoxexuz.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210818205737.pdfIn PDF document text
    • http://slsnn.ru/content/files/zukulikukugigu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/26679145417.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/o01fs3uc8ouskt8h9q090r63l5/82888862604.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/rexoruxitofisidiwavinokum.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ruzisoruxi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/47fc1eabda6650c7eeafada6f02a4cc2/63275774123.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd107ecbc8---2137736743.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zexemiludowoniwasuzev.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074807e2ab68---93093650850.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/ruvitunojufopitujogu.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/xudepif.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8294efd7e2a284ecd3d0ae041eed0bb0/54912060401.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jnmtj41vegv3hbrng2ihqopnhq/jowujejewewefuvesu.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 18028 bytes
SHA-256: f14225f63b834daa34e5d17096e39baf56ee02420e702e9f45a83f491fb8f342
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 10276 bytes
SHA-256: e2b125839eb64483cc23d0dad4a33a9d98fb33c8c5d401a672ee22a7f92ae489

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