Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c41cf93ba3c4a68…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 12:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d979a56687700cec09654666c2364a63 SHA-1: 509117eca4e7cb642b29691e397e799785a9dd3d SHA-256: 1c41cf93ba3c4a6896f171fdecf7113fc71be5cc2587f48edfb55340f8d0438a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure itself is also flagged for potentially hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://klpa.net/userData/board/file/wiliragaja.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/58201588036.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611723d5731ad---pisawagejika.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/80396836455.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/22745491899.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/72446374832.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830bdc565a---84176279844.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba831d5b97---45285213912.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2273a94b49693deeeb864fface38b097/lepozixadoxuvedamide.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/42801762353.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mvi5n9flnseajka4sn908u7jqp/73261228168.pdfIn PDF document text
    • http://gdgom.com/upload/file/210705040549291759jzcui1xw0jtb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49af2453bf---zakosi.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/75641722146.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/64673597530.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/lenimirikuxipinodejo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/84c50802ddd971b27e8569de1ec71e74/kafogosije.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fe36bb70a893bb10510a737ab319d650/budesekasipumavamex.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/22050648763.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60fd28972e---gaxofeligimododaxipowef.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/kogavivuzefisuxumi.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/lajinagikitux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=retelling+a+story+worksheet+first+gradePDF 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_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 18492 bytes
SHA-256: 70a748ca6deaf217016702ac3743168dd85545789610b672c274519604ce3221
font_02_sfnt_off00013e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E73 10968 bytes
SHA-256: e87976c9bd1baea9211fdcf941204757753720f6928181c8b085af2d89af5d05

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