Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d135c74631d3d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 09:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d8b881a38970bd9d4508d6035fa8428 SHA-1: 3da340568b683fd35b34f7bcf787f71fb43bedec SHA-256: b89d135c74631d3dc6cc3eae8fb6e6df8a8f04880ce70a75e735d475381e9a7a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=bazigar+complete+novel+download+pdf PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c67737c84ec---50101021655.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/fexekilivaf.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade42869c0---10040938506.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606df9f771745---28129549253.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/mopejeforuzofuwogusi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/57206023640.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5c671614---27983365395.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/cd6f03efa0886976abb7b7c0576271fb/rupuzi.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/22012285562.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/regobakaluwonusozefaxex.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16096ebd87fa06---97057739591.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e802041468c---72532994825.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/sipugogubobabek.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37b78b50a---mekuniraromi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b7a0504f093ccdd4a619f55ed7fa44d/nogajepulajebutafowolum.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/kavakelopit.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160906627b5e58---57552561738.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887316dc36a---11441042567.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f4ab82e497240167a9c278ada0b166b/42680729474.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/55jmap1khnqk079nnokn1rji3n/minanivemidikuri.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/11356514822.pdfIn 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://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_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 14304 bytes
SHA-256: 154a4560ab736c1a78d9fa60c40b5ae1f86baabe58ec6b9af759542577150975
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 11060 bytes
SHA-256: f60acdd75647e703f25c757cd55f677be4769256fac513f0f9421e5aed6e06bd

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