Malicious PDF — malware analysis report

Static analysis result for SHA-256 85238804de14ce81…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3362a48edc691c16626f22e36e38214f SHA-1: 1f786c4baf03fa81e55a91d93340da567a8db2e6 SHA-256: 85238804de14ce81072407d0a352e395b564f88f286b92c0a724cf37a704e263
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=the+old+guard+book+1+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fe59ad41---divijosopedevesazipodoji.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c829c5175---kesosizilokun.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/63534475782.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/70448269456.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/11433287703.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/64884197792.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/36568320959.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/12789110700.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/7891605420.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6ecf96d---58103353262.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/65113233463.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/1966482184.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/dagoviwefarokiz.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/46493755380.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/lobejuremejavafopaka.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/20437694496.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/25141182597.pdfIn PDF document text
    • https://businesslife.com/content/files/pepodatujexuxudijubolekit.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/89863824fcce58bf268df4c17e67a271/48112027974.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/losanudafilu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e537b4831e---visakafezi.pdfIn PDF document text
    • http://labotinnghia.com/img/files/wizavamojubona.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907130938500231.pdfIn PDF document text
    • http://bdsductri.com/upload/files/serobakezekuto.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e2c33c500c03a8a4b39fa06d9fe8cb97/gogotapigub.pdfIn PDF document text
    • http://deauville.ru/files/file/banegegija.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/43154479413.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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10660 bytes
SHA-256: 0f8ca00b63a5c6b1327ec0a29aae676ab77a5292807ab02b07b198f7cfea0b0d
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 17872 bytes
SHA-256: 213e9faa65dcc3cd3b091243c535e801275f1f1dcdd643445371cec56a78e7df
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1