Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2977c90f3aa868…

MALICIOUS

PDF

91.7 KB Created: 2021-07-23 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99416823f854c6fff2249b2539815073 SHA-1: 6ecd62acb630be776a2e6c3df23f22f164b4e551 SHA-256: 5f2977c90f3aa868faf6aeac96150caa500fea8d5acfeecf78f032475471522f
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The file also contains numerous links to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/poluvibitowa.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6dkojehs0eb1bit1r6ejcnqv63/piwonuxedatuza.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/6nhh7g4pmvinqc0f8tcp6acoi2/vamemakubirogexin.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/wuzexaketorakowuto.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bovelajatuxulikenevim.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/zifugele.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9b61675f2374ebdb91861c38a7f0fe8b/59494884039.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/dagalefixesugelup.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/vinozunomemumofezuvu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jifunomikudepeparabuse.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ost7flq8pe4moeqtejj85cjou7/lelilofotomajodubilep.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/lotaravusamuziwatoviv.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1d278c92---27394694600.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b186957ea---83645454831.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/29112529588.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4989869807---xajotevebegir.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb66a3e01---72248066276.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072acca8da3a---bovidibakifapexelajufuw.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859fa9eb782---sapibapezig.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fe5cded1b184560d843a26b1541cdeb4/36400147878.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a595c60e---meduxigikewura.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9ed7e627---44913745008.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/12012329894.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/969107b01f2a537b307a6db2195ca57b/widolovijujetimobutazeguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+transducer+that+converts+measurand+into+the+form+of+pulsePDF 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://ei-notes.blogspot.in/2012/05/questions-and-answers-on.htmlIn 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_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 16924 bytes
SHA-256: 9fadbc97e5b2783a2c2f942499a6d9fcaaff449d75156cc8fb70406977d0f641
font_02_sfnt_off000144e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E4 11032 bytes
SHA-256: 57c7068d09072d15f9414b7a5b116e6707d11b4034504ba5d091cc26b7b55b33

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