Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a545606e97b4ac…

MALICIOUS

PDF

86.4 KB Created: 2021-06-18 20:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 98dd96fbd6c9afd7bbe2766f32bd9db3 SHA-1: 3c894e2e3b563c39e66f15b5dce552f53091a78a SHA-256: f9a545606e97b4ac77524edc9c3aec2bea1eb04b2c07c81c3a82c505e6887fb0
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 https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d605fa4c49859571bcb24da9f71b5cb1/83548703051.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdnplutrfcc9m27gj6o6lc948j/xikuzevonanidu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/11693805735.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/jaroxiwuzume.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/juvoxitosaropufogokome.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/924270b75134b16222f6b4ee8338eb5d/16583647106.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfd51d471---80698000342.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9bf9f640---gagul.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/8186788951.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zigegovo.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/28135784941.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/sidiwikutax.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cecb051a1---9943771637.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/71291263080.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/39stjubcktrh3iqgd5k65ed8tr/vuzerewexufovozozajos.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d9174a52---bigifif.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/deedc6226e735288b1d44a99fd2236ec/mulide.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/81138395817.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87280d265---20175418690.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/~3/6naE_Nh8_CY/uplcv?utm_term=beginner+ukulele+strumming+patternsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 5252 bytes
SHA-256: 89ceb1745395e6b229b3b705827f9e4222de4a5f956f94c37f06bf7a02b1d87f
font_01_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 2468 bytes
SHA-256: aeece50a5eb9a4290822f9bc1e1b61e18dfbc7bb8f2c85e32e9156ec0889c735
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 11932 bytes
SHA-256: cacf42f7c27cfb57a5ca5e9de05702bf2b0a911acdd1f06ee894b69814769097