Malicious PDF — malware analysis report

Static analysis result for SHA-256 b198c857877a242d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 20:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0438b7819261184a2c48ad96028b5958 SHA-1: 6f2d20815d86fc9deb326feaac7c516b6ae7acf2 SHA-256: b198c857877a242d5de458ddbbe7b1dab178c3a922b7ee8e6c8b134656ad843b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://smidgel.ru/uplcv?utm_term=text+mining+classification+clustering+and+applications+pdf PDF link annotation
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6346c636---gesikemi.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/dugekaro.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/kukatekolesesobejuve.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee16d9af513---11699580362.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c602273b13a36929036de6c672d67681/40555183278.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/fuwezebalu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/81627169715.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79813072da---rizixewelukufinet.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/33191556053.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5d22bf7f4029fe1c1b900964e449b387/mirolijodog.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodifamixuse.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072724801812---89709452051.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6162da18---moridogur.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/vigevidovok.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/dipiwopusubenuwez.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4638a364---tukuxelirurazadoxikemugit.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/34446836120.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/toraromidu.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/10418605560.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/sivigunoxigetojivezi.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/11978533770.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b471ceb16---rifamavijakegavugexuj.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farurusisolukok.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9223b724dd3764e8328818d6ba3557bb/zobojagusuzijivonaxixala.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/mewebuturavenatugenirifi.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/79142065315.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/wepefuponisiwuburixojato.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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16968 bytes
SHA-256: 4e1e3065bac32afe61e51b64eb813af662b35dc6eb40060eadbeb600f89025ce
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 11128 bytes
SHA-256: 7e8d74cddc47394d954f027c333659f49fa919370afa9195e4cbe6d512d74579

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