Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538e923a7a06938…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 21:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe68e3d5ab12f193e2b82678f90da358 SHA-1: c2ff69d4fde30cb8856d72bcbf8f095d45f11742 SHA-256: 9538e923a7a069381389e814e73cb54a996acef7f34017b7c957ec4c726549be
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=the+botany+of+desire+michael+pollan+pdf PDF link annotation
    • http://dwhs79.com/clients/15834/File/zogilufisomusalod.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/663d287aa059aa0d104179029020868b/mironifunone.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4b2b778a5d7b682da92be75d9e10e054/zakoretebibojolev.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/xasojowovedimasadama.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/puzabaj.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/peksj6dqhfjgv1njdkefvoicho/goxapob.pdfIn PDF document text
    • https://stvorki.ru/files/file/74302391992.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab285d55b53---kizowapa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaed145f74---tuwoxamovamiji.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/801a28bf635f123087fe40e60cef7c45/57622179027.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611542c435975---54631926408.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/golupakijobug.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672a030969---nunenano.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/68551404115.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/22044240022.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/25770051777.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/48015589888.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/81325064204.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/dakisiresaditemakib.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7bbbb4193---51220011020.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b76b64aa---vupirilapafej.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b11302e124a---16713993587.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sijivakixolevub.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/72888833061.pdfIn PDF document text
    • https://bursac.net/userfiles/file/nizomube.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/64405777424.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2962ac9bca---lavig.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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 18096 bytes
SHA-256: 3e782b36d328d45ae7ac2117f34297329648337b10bcf3d04dffaaa87e078995
font_02_sfnt_off000133d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 11104 bytes
SHA-256: 1ea3ebec347e4b51293d6784778678b7130720433f61a05b1dd1f4e1f8a56131