Malicious PDF — malware analysis report

Static analysis result for SHA-256 1535b93496d296fd…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf36247ec4c6a96641d337705530ffeb SHA-1: 1f32d6eaa7e6c3ceb605eac44d8a9ba71df8e4b6 SHA-256: 1535b93496d296fd89a49dc7f80a04e4c9549bd463fc75dda72097ec2817a7d8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=sindrome+de+turner+tratamiento+pdf PDF link annotation
    • http://seowonbattery.com/files/fckeditor/file/108000870461234a209413b.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/gikipuzijogafivev.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/45549494660d904286f893.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/mudukimola.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/02/file/vorudogetepinuvaruvuso.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hbo07vrjrg5ssnmh30ot00omu2/xezebobamanurunixukepot.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d3ce5d971e37a524d2c8a9d2fc36d1ec/99687250817.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55ae70c03---93019570371.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/xowatiluwibi.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rawelunavafowawazubumi.pdfIn PDF document text
    • https://tmtteks.com/files/tafodarujenifumoji.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/504a34c82145c2cf649e1c3770ef0f8c/75791895479.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2c1b91cf30e79324817e1005e9f205c9/29615786496.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/30bbd3ade48d8b00c9eba1e028fce428/3742929901.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2895ddc85---xokik.pdfIn PDF document text
    • http://rld-carbon.com/file/rokiwikifasawoser.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/temefil.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c858123cd7b---21736886329.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/6067558071.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sufodajofudaloretuwid.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075beb2ba5f3---37279998310.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/50201321959.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e087a2d5.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_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 10620 bytes
SHA-256: d115c6883e4b0f7a4f2353381c491878a054fc839f8ce466fe13b3efbadc1544
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 20188 bytes
SHA-256: 8e887742ae6a084fcb6cb2d850c1ab72fefb856d814d960d9d1ac57d2dacfedd

Open this report in the interactive analyzer, or submit your own file for analysis.