Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a015c6ba7be4b52…

MALICIOUS

PDF

86.8 KB Created: 2021-09-22 09:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8d98b9f9c65ebbea535a46f3ddb54a5 SHA-1: 25d1da36e1d547ab37de09e9742b091fd96d75e9 SHA-256: 1a015c6ba7be4b52ac477f14ff43c2418c4a663d80257afa0b08d480b6255d6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://krisoc.ru/uplcv?utm_term=present+perfect+present+perfect+continuous+and+past+simple+exercises PDF link annotation
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/wijatelunofokixopizuvete.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/79635750997.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/32a60d6c08db860960e28755470673cd/valiresif.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/cee7ad63bfb52def6d54acb822c712f4/rikotogixizimol.pdfIn PDF document text
    • https://angkalaris.com/contents/files/50165757912.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0d43f8e5b3a7b6ad31158aa38a012f43/6034416737.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xugatabimisamupafe.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/jenenepelivipubugate.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/basiwabatifesujeraz.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/14300543997.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/35919636610.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/nasudub.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/72075768790.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa0f7d0cb---46403906439.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/77tvt3e43qd47d4mkdflsndlan/75142251885.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/91893900821.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbae691d0---56650421410.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a559311dec8a9d07b66c4f4a2d6f1b47/78394981159.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xudemajesisepuvogab.pdfIn PDF document text
    • http://0048.pl/48files/file/63339145389.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kaxapoju.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jijegubij.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210907170001.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/54221424357.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/48407596178.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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10984 bytes
SHA-256: cc90b3835762a5756b6ab634fedb05707f50fb8fcd778bb5d9de03ea020b766c
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 19252 bytes
SHA-256: 4b921a00ce90a5cc412f0fbadaa5c6f0fa2140584c9132cab24c7fb74677551a

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