Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aed05fbe8dbf018…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 09:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f7777fd017924239337ede17e8078ad SHA-1: 37cb3182729edb14eafbd7235d75a13ac3c8e70c SHA-256: 4aed05fbe8dbf0185e62930987786fbc0a286366d0f7327ca076c52582cfae27
196 Risk Score

Malware Insights

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

The sample is a PDF document that uses a social engineering lure to trick the user into installing a browser extension or update. This is a common tactic for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://inwebjor.ru/uplcv?utm_term=how+to+block+websites+on+chrome+permanently+on+mobile PDF link annotation
    • http://tcgardening.com/userfiles/file/2021090120054673499.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407673f5af---53203737905.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d485633769a1a95711258fcfae5d70e0/zazanasolilap.pdfIn PDF document text
    • https://egf.tw/test2/images/file/duvofasof.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090820250673499.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/49954044581.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/70774396102.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/wuvivijag.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92050061743.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/watuduvumotobene.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43754709517.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/gukekulalu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb457d67e---lorevojugajas.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5flrqvr9quc29jjdg62tb6e46g/sixamevi.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_125423.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/40082080070.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/17869760306.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b368567a37bf2dce17ecb72b248bb3e4/kogaxumez.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gobimanerurusula.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/dugixuwudamitezamakitas.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/22738965386.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/91679773736.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/39124528077.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/xobisovanilatotiw.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/makuvoguxozimozumiserer.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/vosof.pdfIn PDF document text
    • https://educhina.mn/editor/files/jowosuxetenoj.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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 11064 bytes
SHA-256: e5938d5ef664ef955c2bae1192fbc5fbf7cea2793c251d2ffc8090750ae48da6
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 17788 bytes
SHA-256: 5281922274765c4f6891464c24ee583e40281edffd045cdb9cf7304bb798ac34

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