Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddbb92d587ce9b5…

MALICIOUS

PDF

82.8 KB Created: 2021-07-10 04:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f1f30b61b25d87207394a5aba24de02 SHA-1: 4f6672e1c695bd868fc84515d16a99f5d0cadd64 SHA-256: 8ddbb92d587ce9b5c8722d8c879453442b70218a013bb7997aa6d131e6f756f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tr1um8qqruanv99i7a269u6e52/ruzulagorinarigalonika.pdf
    • https://menu2uplus.com/images/file/rulivozupu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9acb4182---76266573383.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734abe9a035---bekalamakejuwi.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fe2cc6bcd---3944074635.pdf
    • https://bettyloupaints.com/userfiles/files/37799391731.pdf
    • https://local-atlas.ru/userfiles/files/14108394942.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719e9dcf9ec---98295325482.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6995c8ab0---mivaparesaresutepuva.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/wuzotowaropinivas.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/76027399622.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607282d2d948f---sirojutamakofapawokemeler.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768daebec19---poxakefok.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/079b211e9fecb9b8bd9b4872505e1e1b/xiwopu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/091e1ca447a32df78de6d70e22f288c7/petevotenewi.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/02qnod1av2me2j75qivic14l07/15846954846.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/57857710177.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/runopisakob.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/74492293516.pdf
    • https://sinarwaja.com/account/files/38467850034.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/xufajowoxojosetozeretazuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=clat+previous+year+question+paper
    • 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_off0000dedb.bin
80100c119572d73d7b41ebf30354ca555d39394aebcff598c0b5cf01279d6a82
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10700 bytes
font_01_sfnt_off0000f79b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 16792 bytes
font_02_sfnt_off00010fad.bin
0cb6530035d1c816eacfa396793871b55782e08faf07d141b398eeb380fac69d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 17308 bytes