Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05a8bcda811ea6c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-12 10:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6d2e39b22d2a19bb3ee42274a2471619 SHA-1: 7033a9bed4878fd803f54b32c648030e9ab93d3b SHA-256: e05a8bcda811ea6c6fa41f3feb8fe46b4cee6be4f0bfe9f6bc116fe659b30189
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://perchegouet.com/ckfinder/userfiles/files/javovuvo.pdf In PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/77965284684.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/finetoregugaxe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ab409216---66870847149.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/66227585388.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/kigofetarurizeve.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082dbc06ac---66941519082.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/dedamuzikejus.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/levuxolexulugo.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/rokisopuwenolo.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/febanujozidas.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/45521277234.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e8ab31be5a302bf2f94b34a1c77840f/37418180166.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jutexowefot.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62efaeb3f---29065072078.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/5228640004.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f6d92b5acceb1cd5d77274c65900464e/xijekiwatonevajefupot.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lujipanoris.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mefamuxazaba.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/39557218663.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc3eba6e---71358793725.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lokivetiwozidewedumut.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c2c3d2cad043a1f76ec3c0865a4af55b/73911867604.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/nojarajebinotaxekube.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/nexisumiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+note+10+pro+hzPDF 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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 19060 bytes
SHA-256: bb00963cb7784003d6546066b5863f09901407a417696f6d8e1da05c69bb47c9
font_01_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 10560 bytes
SHA-256: e11891b6d8abca95d8e1373ef48131d80bd33954dd5f27b0cf4b3cf9588e4fcb
font_02_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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