Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cf50550de002a3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 17:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c35c1512f59df9f70675d8331b0e97ba SHA-1: da2644c12442f4c87bba92cd163b8ffa7bee74d8 SHA-256: f8cf50550de002a3cd6fcec9fbb8217a6fd1c283a4749d2758a21d9bd0bb59cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ferrocom-spb.ru/userfiles/files/merepizugorilamup.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sioqkpjccj2fus8k6msm707vv9/denakiwebuvarav.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/47700876357.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/557d849b3e522733a8750c63617f3d9c/zatebejivinusebiguboz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a888b2a693---46068289030.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2c5dadf1---pijuz.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790448dff---kanofukozeramizotigifari.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vnfovm0buifk2fti3ljm833h9c/rujanos.pdfIn PDF document text
    • http://iltorg.ru/upload/file/fiwewe.pdfIn PDF document text
    • https://ubranni.com/uploader/files/xusaxuj.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/tutotop.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/24647698519.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/duxaromamaxisowilipu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/38740234c7de108c8874b17c1618de7c/32263610092.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/87b395618d5697f10be6cf685f6e2077/romaxuvuzudidepagetam.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/23e58fd6ea6b9535b2295177f7d13e1d/48596273193.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfb7127b5---jowibivosevikuvaxal.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/72050025968.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608441c89d653---zoterufojow.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/73680332073.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e27a97af---20893558361.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/98327571659.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6441cc72f1b7c11170c39199acc40351/5122722377.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77161f4544f512f673701b06cfbb4d7/loseduduzewutakikivuganor.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/31682274473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=user+manual+for+proform+505+cst+treadmillPDF 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_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11144 bytes
SHA-256: 59d893461ab14ac4d238939038d5c5dfaf7e4a3d8fb142a3b2f0217035066f74
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16736 bytes
SHA-256: be3a078a917bbf3ac9528ae712e5ff5b2acd7a998639ea137e8be11d06228486