Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a599fef3fae248…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 23:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8f7de417287db9ef4c9b434a8868a7d SHA-1: 46167b06dff7f5724c3faa16feee178a48aadfbc SHA-256: d2a599fef3fae248d042e47b35b60521d3cfb65abe5b4614a55c663e1e90c8ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4e68cb54fddbc014e215c3052af109f9/75829461483.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3f851e56---vadurarudogir.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d183773bce2b2cdc84193f237da81902/89477735566.pdf
    • http://al-farh-iq.com/upload/userfiles/file/9857764375.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/14c5f5751e26d4af98420ef5cd5ff4c6/rusuwivurugowuza.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/22f1cf849e07691ea1acd313a6a50fcf/lokuw.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42187f49f---fagixawiz.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f0374c8e---92598652063.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8249f36b---xugoneletubidatuv.pdf
    • http://charivne.info/images/file/81858803501.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6eb8a31df---48756173830.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7ba41ef89c88e40fc6e2562488d52e73/tixomojakud.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/l5oirkek5jk3rgidqkjasoq28q/sawufonobefop.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gaf92jrlbtt93301e2mnsr0n5l/80262140378.pdf
    • http://autohondl.cz/userfiles/file/25022894645.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a43c18124---30216777413.pdf
    • https://aulacvn.com/upload/fck/file/68520832849.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160842220dcd6e---zelagijom.pdf
    • https://honghow.com/ckfinder/userfiles/files/39089933018.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/03rrts1dui6hbh1c40lpb408ug/85491037451.pdf
    • https://m-isc.com/userfiles/file/gixiwuzojiparigam.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ac7525e75f582bfe3c888396efd61d62/labobidima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reported+indirect+questions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d6.bin
c152f8f5b2e3c9135e33402e3cbacb38f0682385fbac2bc3c02cb2cfa0a2f82f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 10588 bytes
font_01_sfnt_off00012ce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 16792 bytes
font_02_sfnt_off000144f9.bin
482caeb6671f2851853810cdd7e2ca47efb621da5a91e3bb3eee2b1d43b16f29
pdf-font-stream PDF embedded font (sfnt) at offset 0x144F9 26584 bytes