Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda85a85d45328a3…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 02:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b77ce24d3504678816ee73c8782f34b8 SHA-1: 037ddd61a5d4b3c3fd2b53d7488108de047d1de3 SHA-256: cda85a85d45328a3c2be85fbd9fd95434e46221cb3da2fcf0dc54c56584a0160
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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 http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/56072253118.pdf In PDF document text
    • http://sportsgarten.com/editorData/file/sopesasujepi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161563850402cd---faridanesukawefemetu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16149a3fa4e993---kunudusofo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c08062b2b9daf7bb1c2ab0c1eb20cd4d/59232831703.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7d39ad46---nirawujewimugizekas.pdfIn PDF document text
    • http://kunbot.com/upload/files/75856153804.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/sanabokuxilifaniwu.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/77592879609.pdfIn PDF document text
    • https://petala.gr/userfiles/file/82410581630.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/febenumewo.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/49293677179.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/51121443977.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/parudejowuxejamafu.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/92049408159.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/bowanexenine.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/nasakenofalikepu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc774088c---gonev.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/97247968782.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/xitudodebaweratevol.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/58108800846.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/90978079395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+anime+themes+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 16204 bytes
SHA-256: 459fcd442e28872920dd576b6b3c325cadb138f3309d840c8e99bada279a8556
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 10548 bytes
SHA-256: 72d4f422b97b7ad80e1e002786f76bf204072d5bac69997b7f8bbd64f6a1274c
font_02_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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