Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5232165b81fbb2…

MALICIOUS

PDF

86.7 KB Created: 2021-06-10 10:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b4cb1042512bcaf13b9af9569add1db SHA-1: ba5df59f32dc46ad2c2a40ef8541e7c6fe056411 SHA-256: aa5232165b81fbb2ba7c5e676d4b2fef8e8cc7d48d50e8a84b1976a3b4feae66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host or redirect to malicious payloads. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+3+apk+android PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ukhbtb4qeia551jvvpbl90q38n/42058419827.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074578dc8834---98663682872.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/18431e84a94b39a92f506ac04f065c53/kufemelogujubep.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7f98e3d84c09d4b4050ece7542fc68d3/52101187253.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ecc657e2---46947555657.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/340857703a7943abd35d460e5148840c/41804101408.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/874eip74d1lmmu904pu65c50d3/24055044426.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d5e730cf---wajobezide.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a177b4206a---dewasisaman.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513102818841875.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/nanexujezasim.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821cdf88b6b---bemegikalizavekebujusom.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/91115155534.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59c69828c---6636791952.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cda87ee43---10464325584.pdfIn PDF document text
    • http://envigest.cz/upload/file/nezizopokenaxitaviwir.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/35945529923.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2e3c52a0---kevudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 3808 bytes
SHA-256: 12a310ab04416497fc7014fab3dae62375dda7c33ce0d3978d7566424228d101
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 5472 bytes
SHA-256: 56d635f2e84668b54b927dbd7437da10e7c58f52b07be4a38a8c9073957f4ed5
font_02_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 12864 bytes
SHA-256: 35605dc2a06aae8f09a495808dfa178df475190751fa15f91318cc14a076ff4d
font_03_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 16496 bytes
SHA-256: ce78692e02ca8ca54bd76cd6c1adc9da68cded12b5c396d6d635a1bb847aeadf

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