Malicious PDF — malware analysis report

Static analysis result for SHA-256 daffa2897aa86e97…

MALICIOUS

PDF

95.2 KB Created: 2021-09-21 07:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6b664a25df3173cf492c5b3bd0572043 SHA-1: 7d7c072895e761e98ef8e165712843cf62f93e7e SHA-256: daffa2897aa86e9773980139f7b91d49e94ad2dc6bfe36aa06656a33f79a71c8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning attack. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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 https://wastran.ru/uplcv?utm_term=kimetsu+no+yaiba+movie+full+movie+stream PDF link annotation
    • https://cartolmania.it/file/31163709882.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a57c6409c---taxefopotino.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132682cc441d---lewegemasu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/mipexekokalesosuwonu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/16805897296.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gikopumewevipiji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4919ba22b---83585310278.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xupokekuzagu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/70887651880.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/fozutibox.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec783924f0---zuwukuxuro.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kirifubu.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/silenipetuvepaki.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mezevilupifudiv.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/roxukegaleneloxum.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/46861974625.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910173718.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wipenarisibesunodisofiwur.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/zilarokofuz.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/godusofotujinaxa.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/26533847702.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/fetif.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/71773116436.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/sofamixo.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/65933133903.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/54291711355.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///fobinozuvazaboz.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_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 10788 bytes
SHA-256: e0f6201d3fa866e0a1f2a8bd715db81af0b69d7d51b8342b86c17f8b4d4ec098
font_01_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E15 18876 bytes
SHA-256: 85272672f8714b1dde2d262efd0644ba1ca50c29d22db7cea9e09e6a7a5c1178

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