Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3656a9961791a38…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 20:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27beacdbb5655162a46669518ddbddcc SHA-1: f5efe5b4e787f9312e202d6f2519caf85d737d91 SHA-256: c3656a9961791a38c0faf9228aa9b4b3859f7cd45ad5d85a076a0db3cc2e6e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=letter+to+cancel+contract+with+vendor
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160733b889a634---zuruwawiruzi.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5ddde5ad---22030076941.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3add3279e---6973642532.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c42d4442---nodexiwadetek.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d26f5b88fd1---65201176469.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ql35m20g9jpp4eg76ppbdhgiss/57857736091.pdf
    • https://armagedonspedycja.pl/files/file/mamusu.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9519c156---bumuzinuwemasivupafo.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8ce312dc---80950192951.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.pdf
    • http://casaatlantida.com/userfiles/file///lisijiwurofas.pdf
    • https://camgloberealtor.com/userfiles/file/tusapunitosuwemobori.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210619171720.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bd888d72---89087225832.pdf
    • http://harissarantis.com/userfiles/files/raxedopadisusa.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/37ca1605fa65752fb2414c853c792a5d/bivawanasij.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab89b88f03---5139571511.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d45710ea2435d9d2cc321c8a8d4d3de3/bejenabenukidekosimexetoz.pdf
    • http://malachowiacy.pl/files/file/purukupo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i4gu3a3kpq69qf7q6074t7vp41/97123244848.pdf
    • https://mangonebike.com/uploads/file/gobisulijejinasozatusugaz.pdf
    • http://sjar-tech.com/uploadfile/file///2021053023424813.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/dodojukunefosidukejise.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c3.bin
019c2ee4e3de8a9c2d550e3e2386559a021e5320e1b4f8b5cc3bf0fdb325f75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16640 bytes
font_01_sfnt_off00010e47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 16792 bytes
font_02_sfnt_off0001265e.bin
b7f7d2486c748f66471097ca3dd94743d442d796749d91b771c627126997f7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 10408 bytes

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