Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64b81cf25ad3f51…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 11:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11c35375c19ad13e2eded8f58b2e66e4 SHA-1: e96c696f186c74a5dfdf7144d215c2f34fff1c1b SHA-256: f64b81cf25ad3f514c65b235f9989c092b94cde33216d76e55eacf0e3f8e1d46
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting. The document's structure and content suggest it is designed as a link farm, likely to redirect users to phishing sites or download further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=faces+edges+vertices+of+3d+shapes+worksheets PDF link annotation
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/77605921005.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/kesifelekojisikaker.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/bebubigafoxag.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kajasazaju.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/81d3893b80a446c1060714642a2a8a8e/50340584298.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bebot.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/zifidev.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/73229160190.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/16279030042.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/89948286418.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3ec50ed---binamikejepiweziz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12af8772c---88189422706.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/tizoropeg.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/femisebonadawupabefofaba.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/12759281326.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4879616944ef09cb94170944a0fff1df/17318977171.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gumoluvena.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9a9d4123dd48a36a98375047f2a97487/32886689184.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/vudepeb.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/80964380428.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/lofow.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/86996647368.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c067e28b3---lojojakoviretudadetu.pdfIn PDF document text
    • http://learningkey.org/userfiles/13901572305.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5dd2c2cc---14466151910.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894bf50360e---loderitujas.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160882991039cf---levememidusoxemobefigesub.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/68019977489.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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 14080 bytes
SHA-256: 393296a0c3aaaddcb3f46eed656f74497bea32cc0babe0dcf8f28c0251229e02
font_02_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 11144 bytes
SHA-256: 5c4a922446cff875a4313ad71ecf4c80ca243656fce246573550567cafbd828b

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