Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb4a7d7861a5a71…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 09:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9167a33f98fe07c97a45319a004e045c SHA-1: a0bb57170c8b9d39a44ad98266f69ef136472fe9 SHA-256: 0fb4a7d7861a5a7128ffa2b674b0d7518979838e0d676194c8747ff1815d11cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a download button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=manhattan+gmat+books+2020+pdf+free+download PDF link annotation
    • http://shethof.ch/cgi-bin/dynamisch/file/32141211250.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd557ca5c1---jejarelunukelik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085459c23324---59274936156.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5e41e4e7---tizusetef.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kokafikodusomiji.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae87681e1---xedewufalatabetuwefuzan.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60935f346---52823992208.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ea8492fe---ledegalavufupavotupitutuk.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cdee4f2ca5e84a3926302a9474d4b47a/malizuxovajosid.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac44cb0f3---kunudobosevigipir.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/pagotenawevod.pdfIn PDF document text
    • https://agatanorek.com/files/file/litobemakalokabonekutofu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0047841001620177894.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/buxasajedafawifezifezi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e27114e321b6a6407bdc09f1f8110b68/29659700419.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2e61a777b6e844da0d0a5ad5851a0f67/97272496663.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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 6028 bytes
SHA-256: 5d1713830b371559da0ff72224820f3b6c97749a12a13af1ef6003de34ec6c0e
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 11620 bytes
SHA-256: 48dc9618ca944c1d5822438b5aa20a0c9fdd0e8dabdc9701d159117880f92bff