Malicious PDF — malware analysis report

Static analysis result for SHA-256 494481bd4f1acb2e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 10:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 471b2f65d80815ece00b4ee01891e7c1 SHA-1: 359711a1f43c8b3502bc633389f7c59cbeb89112 SHA-256: 494481bd4f1acb2e198c26275d36d5e14a4ea23f38d3f610a18e5742bdd347b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting it's designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://0965818789.com/CKEdit/upload/files/18296129452.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8d1627e291b90843db9149a00e4a1a2/99156831596.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g5itj0eqck2u9lqr8fgkun7r44/ginefutijoza.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bpb0occcbjk3eck3s712sevl87/37690843801.pdfIn PDF document text
    • https://rajaunited.com/contents//files/topugasa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f742b85b5---xosulomowajapizapoke.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/227f9d531b1aa939afbec41997f5cb44/83034217656.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/gukigibedolajofevajexikem.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e85685b7---50992024025.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/3vdc7jrjnhvku6cqrqj3r4bfas/65942058436.pdfIn PDF document text
    • http://calisnt.com/uploads/files/45789712425.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/gifupuwisorulotak.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2453ea8037---daxow.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a0c41f9bfbb14b5076944161a7de6775/kegemavodexajazotejinizi.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/36994582157.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/gowalodad.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/dd79ba4fe1f32e5ac02584a93d07e9ea/41903023452.pdfIn PDF document text
    • http://innotack.com/userfiles/file/69132027625.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/11519454237.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lrstsepnggohp67f14d8rqtki9/84208636898.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/kobebefuzemovosanu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/75886832411.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81374960d---jepusanajowebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=an+introduction+to+medicinal+chemistry+6th+edition+pdf+downloadPDF 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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 17220 bytes
SHA-256: 96c0b690f17dd0f30358b1850f7dfb7c462ccb6f6a6066d46b7e348c621d2e73
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 11336 bytes
SHA-256: d097081fcfaff7ad2849fd8d95a60d9dd2bb5f145cb5720fbb27fcf230389ad7

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