Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd28e446f30b926…

MALICIOUS

PDF

103.5 KB Created: 2021-06-13 08:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ae6aa5a004dcdd498ea4d5b32c2affb9 SHA-1: 2ca5c02499bd6147047293a182da9fcd21b366c2 SHA-256: 7fd28e446f30b926026cc14fc696a29e63e00e1310d28a663b0f2c17250cec27
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 Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it is used to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm structure strongly indicate a phishing or malware distribution attempt.

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://synerhu.ru/uplcv?utm_term=lakshmikant+public+administration+pdf PDF link annotation
    • http://angelojrobles.com/admin_initial_test/userfiles/file/29995437124.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070273858ce6---kozexire.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/nokuximu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdfb22343---komivemenusosu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/6088667013.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qse2qg548j0go5choa898jijrs/tuvafogorifibufos.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ff1358e6---lesimilijojelotap.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/an4bi4er3v57ohebg5pkqjjac1/49064374609.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/pidemadojopasurimi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a6fb8c10---73687937383.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3e836f480---lojiwugetewikipip.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/guwiwudi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1f6ef37f2fc5fbe99f637b2ad81d792c/giguwonevesivipifutek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c69c3760d5e23cbf0c8892393a9e7f4f/51807738861.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/sajib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e6a47fed---farilabozomolanol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15922 5540 bytes
SHA-256: 32ff33508c84be6477b9f2eebe0752c0234bbe7cec8f6fce21a6fd522f3d58bc
font_01_sfnt_off00016bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCB 11072 bytes
SHA-256: 6039b9504150697c223f0d01580a462f264ab4c6a8d48de9f025e6c4555ea776