Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cda38108a5ac95c…

MALICIOUS

PDF

78.1 KB Created: 2021-06-23 02:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b8088392c5df3a899529324d79ba9017 SHA-1: 72319af506117d5ed065649cef7df0134edad5e0 SHA-256: 1cda38108a5ac95ceb8d5575e6b135613cfcb01ddb14771355a1ae010ec0a5bc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://thsport.dk/ckfinder/userfiles/files/35558878313.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/467a4f36640da1bfe3c23b3223f1cb59/legasoj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fcb4ddeb---81229643677.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/39309122750.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c531c90ee311bd7d4561fcb10f4d8035/43853400723.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/34e921248c8371fdd0fc9bdf95e11a20/kasosej.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/76280332483.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/31275332988.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57860320832.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zujoromizasitosaxaxuger.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9f50f282---82800958476.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/finebuzelaxe.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/kesizarutifami.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160910d75c22fb---lekotepesoro.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d9c6a60---zibelibodabidoxodaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sleeping+swan+yogaPDF 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://scripts.sil.org/OFLIn 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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 5188 bytes
SHA-256: ac943761614fa03d86ef18a578d42939cee7bdcef19654849e154e8db0813456
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11124 bytes
SHA-256: 6cd7de23f0b3149a49c1161440a631d2c92714f6433a8c31e67d672c97d2d770
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 16448 bytes
SHA-256: d473d2ce7cb349c0e507cd16163c0ca2bca30ebfe7a00a562a0cf8f2f41f2742