Malicious PDF — malware analysis report

Static analysis result for SHA-256 673265e3285471b9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b3903a226156efe22f5b726c7b7c158 SHA-1: 992fbe7e27dbb5d5030ff51d3c726a0d0533b815 SHA-256: 673265e3285471b960022721490ed9a56362fb3f1eafba9b2cb6e1825ccf5a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=yts+movies+and+tv+series PDF link annotation
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/zimuzimovidupulajakalam.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cfd1aa63---konokova.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/bimukutoli.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/m34jnmgvuf6pqio03ojnt4d7ga/bewajewita.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/sowumokezavonapuk.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/puwejaboni.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210919_27973189E1D4FC87.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/40817380220.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/169594155.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/48396123080.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/gexedugopowiselebatunewi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/841d348b79cad8fe2edb1d178ccc8f93/zomevopebokukigedi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/35158550373.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/73084504900.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/8213685206.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fizurikekotokakidofivowil.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/vinajuzonaxabagup.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/30587233229.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/xelemagekizixoxawi.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/komivowetifivuzav.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902125126.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394d26a43e---kamenevu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d16eb716590d7dc632909c88d8b09aba/71296483607.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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 10412 bytes
SHA-256: 8f7525ed2317917f6c8413148c43e15408efe982949e81ceee632b0ef80e200a
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 18780 bytes
SHA-256: 6d087271387309e9ac8a1985aa1bc113c977a64dcba22dd24785dd929ebfabb0

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