Malicious PDF — malware analysis report

Static analysis result for SHA-256 2435abc60b677b30…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad8e9c7fadb388ab0b11cc7a0b922250 SHA-1: eb62d24e59aba812ba9951dbcc15675941043f78 SHA-256: 2435abc60b677b303070a63ca5100fc005745dfd9494d32bd4af571ae0f635d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm designed to obscure the final destination. The primary function appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2998fdf08410fdd8efef24b3e9344aeb/fikajowitekijepaxapig.pdf In PDF document text
    • https://theptaynam.vn/upload/files/79934763474.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/mewanebulagamadurel.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c960f2e6b82e6eccc6fb9c58cab459ae/84941479169.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/78037596831.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/49336580058.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68758c48---87818517094.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/lelapezedero.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66efbd3da---kunolepunakene.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608449164a2a5---66126952773.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fonusozava.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72fb95765---xoluvejugawurebuvujaw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4df2ef2c---datakamo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac72d10d59---putupipizubunovur.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sejimekavatuge.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/651638174.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/8041826376.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nusurikuramugoj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/au7m31pf1q5c3qrtqfqdiepot6/faniwod.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/51421374423.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/56970553226.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/08a21449501cd77f1aa21e9583778c4e/86783696926.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/75074042767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=globalization+contemporary+worldPDF 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_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 10944 bytes
SHA-256: 6c60d8a5c69c43359db3ca37063eeecf45a11741000bc672387b11867ea0dc0e
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 17892 bytes
SHA-256: 9734b4c973b6f680b1293323bbab8e42c283912f14bb79bc68c22636cacbfcc5