Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66b7fbd749b6c0b…

MALICIOUS

PDF

105.6 KB Created: 2021-07-16 15:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8448ad5a276dec63485773c113330c25 SHA-1: 1c4374fe15ae8de605e30f0318d0a940a8a7fcc6 SHA-256: f66b7fbd749b6c0b8bdf96c847bfbdbfce9eaf5ce707279078401e1d658ba24c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, many of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • 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://i-chat.tw/js/ckfinder/userfiles/files/nevejurake.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/dd744417aa7bffd9f09f1047a417f0fd/96889014855.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/37618675220.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7969cb3b03---71613724675.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/irjljjgfpksq7vsvn82m1tekeq/41752123072.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2e290df53daf69771b5c6cd4cca82b30/60684709559.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/34053255025.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cus2ph18kk06o43ffmpn54o5m5/wozujibeke.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee90c9c50---lujebosovevaweroratode.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lefexojigasi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8efc1cf7---99240183426.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/resig.pdfIn PDF document text
    • http://houselandia.ru/files/galina.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/zazoxegadolukapuvadu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/79b039e29907c52738e05dfca70256bd/wimapalakaxol.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087428612d52---kikuxakaruzobenisozenav.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/de3943b8d6770ebca7f3f016fbdad6d7/38216440851.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/343d7f8b4593cef2b9ed5b032ae568d7/81215471137.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/termmbbrq55r35erfjr8ibnnp6/30138215476.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d19dbf18---dejidasupujexemuvejepok.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/zixowedifajulekabowawo.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h0b671dk0agt3hnq2i85jbitp1/82037326156.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/odo9ignhpour2vrv5bp9a0mvns/30478636142.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/49524275374.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0659a2c27d0fed12d3fcb51290583afe/raxareni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=parts+of+speech+definition+with+examplePDF 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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 26288 bytes
SHA-256: 6b6bac7d7a2f43e2b4f565bb948948f95637d62b9ff42617bc94b123a94d172d
font_01_sfnt_off0001555a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555A 4412 bytes
SHA-256: 57261aae64114c3d74d25ef9512f77acd7c55b6b0866c0c694717b767c011c2b
font_02_sfnt_off00016649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16649 11076 bytes
SHA-256: 8553bc5d188145772b991b69f02ab64fc4c028cbe5431252f84205412a981728
font_03_sfnt_off00017ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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