Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d70418263d5d020…

MALICIOUS

PDF

87.3 KB Created: 2021-08-11 12:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ca58e9685e5fbc1571514c0484c29d5 SHA-1: 10736d2ec0972f09a5b72cfbd826c13b449143fb SHA-256: 3d70418263d5d020d6f1d3cd1771f9cd73981aa4cfdddc344c1db12a8c87bb81
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many pointing to compromised WordPress sites and disposable hosting. The heuristic firings indicate a link farm designed to trick users into downloading further malicious PDFs, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilenmr.com/files/files/27916917266.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/tadakopuragumofimurevezi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7fab3343---81298923497.pdfPDF link annotation
    • https://artlabjo.com/userfiles/file/felesowasavob.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8d5918e59b82cdbbe992da64080434c6/kuxotazebuvajaz.pdfIn PDF document text
    • http://carszana.com/image/upload/File/50709945863.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/tezukupiraxasaxesojapo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072189ddd2ba---femakabogug.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ea0ec72fc---zakibumibutotu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/8523719907.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9cdde57781a346143e58b047b1332c28/87414018263.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pibosatuzekozi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087145c641b5---87036773853.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fd9a2d18d9381109a5f0da6490f1d1ce/12670690363.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zizamen.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/23166827895.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/82070432908.pdfIn PDF document text
    • http://altinay-law.com/images/file/19848183653.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/99865058891.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30366474131.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11ed804e4---sitivevefuw.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e123c383eb---malerapukibasag.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/5620983303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fnaf+world+free+download+for+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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10144 bytes
SHA-256: 14cf17316514c9674e59def487c20c64c19c772bfaf0c65f505b242bd2ad03ca
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 17080 bytes
SHA-256: ce165b0f5cfb56d14e8701c803a74ba4bbbcf9392457d4737dec21cb49f2ac9a
font_02_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1