Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a953ec60871ba2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 21:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66da5130af2384264c54eea7a2459e6d SHA-1: 4c11bb62ab71e55c6252ba309bcac2f7234604df SHA-256: 09a953ec60871ba237f9e76723003555eb9f786eb60a64cd3619dcad35fc92c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many pointing to compromised CMS uploads and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2099a58b39919421117fe857704ee00e/39712693378.pdf In PDF document text
    • https://fajanav.com/aym_image/files/58520512408.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607686417d0c0---jatugepivi.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/vetatoz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee81aad2c---8282331753.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/44d3994e0b8f66ddd9a8bda27620ce3f/97861654577.pdfIn PDF document text
    • http://moristas.com/userfiles/files/rarinunadokeborumawo.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/48830367660.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/69ff3e7471060dcc743a5cfbbe83dcc3/17465382448.pdfIn PDF document text
    • http://allier-genealogie.org/File:/gizam.pdfIn PDF document text
    • http://npas.ru/pic/file/kugimi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/38472289057.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/72c05ac03c674683bf0c4668d4912295/20173335340.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9cbac1101f5259eccc04d628361a7c52/voripewasumini.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bbd36a0982e78193fd3a2fcd17cb5f18/97835221767.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb528a1e15b---jonapuvidimite.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d66bcbee5---sanizunin.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/zasodunemowedotezewe.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845224c3fc---36514771165.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/9155683521.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/zilunuvud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777f424c43---riniger.pdfIn PDF document text
    • https://auto826.com/uploads/files/87381553869.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a651052bff7---kodebavuveluwavujufewasal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+para+hacer+preguntas+en+ingles+pdfPDF 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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 11112 bytes
SHA-256: ba92ae4884a673876d646e67c2e3a370a82bb2aefb54140d5724fcc30d658cf0
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 19556 bytes
SHA-256: 7ffa69df07faf67cc37bab088aa432696c88b05daebf7902d4e3980d4f16ad6a
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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