Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7436fff5190931…

MALICIOUS

PDF

76.3 KB Created: 2021-07-27 14:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a19f505bdf7a311cf33f6681a73b213 SHA-1: e40820b3706d78541f070d67a23faa5483418a9a SHA-256: 0a7436fff5190931b1fc366aeca19f8429c8581c5b598309e71257629484726f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f4e75ac0e05d5906a9b4ae02a8ddbc1/zilevovuxirizatisefivowo.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/39839837868.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104281952136496.pdfIn PDF document text
    • https://artenika.pl/fck/file/79946153423.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/68127759907.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/7k011tbkpaa0gifeeqkqbng284/xoweteruzisufin.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2911e9b8a8898cf33378c2ac2afcf318/bixifowotosiwona.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/puzurajemorogizewizuv.pdfIn PDF document text
    • https://soechi.id/userfiles/file/29485226172.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ac925715---mufuridenexo.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b19608a9939dc21b8972f3e2a7ea6d72/73216379577.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/75212922362.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfae94f5ef---xovex.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/judamofiboluguxakabir.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/57hhr9tigbm27oo1436e9boqdf/fotox.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf496b1a8f---3174671456.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4e411488---63205636435.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/23454841560.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vejubotebopogutunipoziz.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/11740439336.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jawuwu.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///47062693412.pdfIn PDF document text
    • http://limmaginebistrot.com/file/1482746391.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f1af037---fatonaguberusumojiwodax.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0dba7be402fa93e59140619fd2758e81/gitidelulekun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=palme+11.s%C4%B1n%C4%B1f+kimya+konu+anlat%C4%B1m+pdf+2019PDF 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_off0000c457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC457 16588 bytes
SHA-256: b979d0c7f0c23c8b12b14a673877726937cb84b8d280394c10236ba646b9102a
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11440 bytes
SHA-256: 78fa77cb2ccaa92b7bfb2807d281cc30d9fb5ac60a14b2ba0da5dfdfcef1c9ef
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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