Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c62f4f53501b4…

MALICIOUS

PDF

83.5 KB Created: 2021-08-09 18:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6607cbf1ffc2a88480fc27f49e7a54d SHA-1: 2743940db135339c4713c040592ed6a6e42741c2 SHA-256: 9c9c62f4f53501b4a211dd7f98d797e78302a33c8355cbe15d5f93f0282431b2
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://brmhn.com/userfiles/file/20210521020847_nsxwhx.pdf In PDF document text
    • http://aitrans.org/UploadFile/file/F1202105211218472600.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5ca385c31fe7248c09355e465943c6b6/romewavelawage.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///15945016281.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b0cae453---gunufutefipibibumuxakipa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4e9dbce1d9d60bff5bf62813c2b40d5f/10979218088.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a96571a35---79685076176.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/gizuxotedavofodepirize.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jejelaxidagafagerolusapi.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/vafaxeguwemenunubupali.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bab587c99---gekefipigoxal.pdfIn PDF document text
    • http://erdbau-rauch.at/98610261810.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65736564361.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9c420398c335244dc586d43d65c936dc/fetagobukapozi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7955649ed70002430d5365b4066c1425/lexijolofapomexikunozo.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pexugovumokideselej.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607881649a812---76888738380.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19062912723.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/07eace5b924a92210257cf77fb2a1026/4253003159.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/69844997020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+put+together+diamond+dermabrasion+machinePDF 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 16952 bytes
SHA-256: 7efd0c31ed19d8b52eb5b4fa2525c1acfcf516a80ec51c29648b9c17171afcb4
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 11232 bytes
SHA-256: 9bd241544fbb2d2c727b533125730b6bb31d0235535ea7a837a2d643fce374f3

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