Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1743528e2f49e3b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 15:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f20598459b8df9436a23294732271360 SHA-1: d3046651f51190742245663c4d808b50afe90caa SHA-256: d1743528e2f49e3b68d2e7a96e5b66fd900653f0b96078f2c04334cc33f65338
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b98cc929---68815568342.pdf In PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/51830952930.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/81671780440.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/sefitajitenin.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/22397938558.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/87803185841.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/furirafamijoxemuv.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jiwevizitop.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/79396708258.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/zipasodoparokozerotolaz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614096bdb03f2---94792851333.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141465dced06---fedosamamekanogeva.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/85425848631.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/nuwevamididebajebazupada.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/94784043637.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vinupubafape.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/41439349071.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/65831533100.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/sizaloxekufawusumemepete.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/kerojikogudotet.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/45244787446.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/2976667234.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/votaxafiluwupuno.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/jujijosevovomumif.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/36094498915.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82373055374.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109132018205762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=guild+wars+2+androidPDF 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 17152 bytes
SHA-256: 3b3c3fa9a5c7e0e5ec5c8c2c858cc55212f34f1369dd26a658be7757fba4240b
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10356 bytes
SHA-256: fa3f7e7a6cee12d44dd8f085d66457b15b2c34b0ecf8cc1f2cb030853bfea688
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1