Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3477061a677d92a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 20:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b8e0bef3279a95ccdd8e029107652a0 SHA-1: ee7f1b55d79341e88d61e9437ab921d5cbb50ff3 SHA-256: f3477061a677d92a5069d25a76701226c26583b769b0a3f9538ac30b15351e2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites and other domains. Embedded JavaScript was also detected, suggesting potential for further exploitation or payload delivery. The primary attack pattern appears to be the distribution of malicious content or redirection through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/nuperivotofaza.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/19738234395.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613865607db03---petifojelexola.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/14999310074.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/jegusisej.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/32837136079.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/nirasa.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b667c4a2a---20137840541.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45470799469.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/rabofad.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16135bc3890946---dikowawafufodemuzi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/98811364957.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfd64ec93---kideju.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/davemibarifuwot.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xiwasej.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/45025842585.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/dejadebo.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/17491292315.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/32219439010.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecdab80df---22915874275.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fokipogizolusukenakif.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/9446514643.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/papum.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/78c02eaba7f2f56cb96a624d41976be5/pepemipisoduwipubopegabi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/38677779535.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/jikimobovawegiweleta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=push+pull+marketing+strategy+examplePDF 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 16708 bytes
SHA-256: bba68ee17e2cf64db7a5da8246ab8b3bf56141395277ca67a930f5f1abb21b0e
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 10988 bytes
SHA-256: be71b01fc5409882c28ff2a2c73cb94d9bc1ac11a3b92053086d55634080dc86
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.