Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4bb45567690006…

MALICIOUS

PDF

89.6 KB Created: 2021-07-23 23:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30794ab7aef90f6d5999c0cfbd301639 SHA-1: 56d9056849f32a6ba11379ef16520ebadb88b07f SHA-256: 0a4bb4556769000600d26a8457351943d19c0627c094df52eb34bd4bf9d604f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://doyen.cc/images/upload/File/46193848175.pdf
    • http://www.jindatunnel.com/up_files/file/65019751958.pdf
    • http://droneducational.com/admin/userfiles/file/dezasuxejajerufenoturane.pdf
    • https://sport-jicin.cz/dokumenty/97260799634.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8a3f20c9b28a7a86ef77cd4a3d45e07e/bafuretekeme.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160890dd5554bc---38152713913.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/golodufetewoliwetedopos.pdf
    • https://pasarantogelsatu.com/contents//files/jugapix.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a4a51005---91359697435.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/50041eeb34dcd5040ea142e596e1e565/32225126530.pdf
    • http://ingenermarket.ru/userfiles/ripudalabinodup.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b499f084---xasawopeju.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aje7410o2p4fd8n0ue3c4rof0q/52491966420.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9f2d78c1---88298586150.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o66tbgl44e72h25f7crhmo9s11/moladezebemujifafavab.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0557bb4c4c---57720910531.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/61720038281.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090fec3d39cc---42530633098.pdf
    • http://turar-mussin.com/userfiles/File/mujejajoxuzanila.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/j45jhlvt8fvt5tuab2ajj43gb7/11458093496.pdf
    • http://aceonlinementors.com/userfiles/file/lesexuwuputajineputonuzov.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rpkftau53jrnrg0tj9knh4k6vb/88317282793.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b00288adaee---96329286819.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa2df06b9e077bdd03bdea0995f2a994/65010066307.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kuxewumemeta.pdf
    • https://cowichanseniors.ca/userfiles/file/68386116563.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090c586b3b23---juvazarafolaralop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wichita+kansas+district+court+records
    • 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_off0000f93c.bin
df22eb0b90caa83ff47a59aab96cff91f1729266ad1d28463dfdb757e267b93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 17664 bytes
font_01_sfnt_off000127f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
font_02_sfnt_off00014010.bin
adb0197e3bb7dc00e760d26d0a77bf601704b06517a64f29e4ccb83383c20608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 10608 bytes

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