Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b42278eabec141…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 07:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad07457d0ead59a74d99b0312f6328d0 SHA-1: 9f4ad1dd9b681975c8efad07cc9c564697e505ef SHA-256: 08b42278eabec141274971f7f730ff3f22ac8ee32c329923f797ffff17ee3fc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including those pointing to compromised CMS upload storage and disposable hosting, suggests the document is designed to redirect users to malicious sites. The primary function appears to be acting as a lure to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://infrive.ru/uplcv?utm_term=voice+and+speaking+skills+for+dummies+pdf PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/67ce818237c8cf86a4bc8600ff173c89/44867623109.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076f346818ef---78538088354.pdfIn PDF document text
    • http://zae.me/datafiles/file/newuvopujizapitobinifawaf.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/korojutorelifanasalemisuf.pdfIn PDF document text
    • https://petala.gr/userfiles/file/bosutozelifejasowevanor.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/roxolapakugeretez.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076531bb6359---54908218542.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756fabcc92---11720948429.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/litix.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ef37ee8e74ebdbda7e99795e34749249/pawowawalomaluteg.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/18629364627.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ba64ae4f---27703630020.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/7600044310.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b7640b03900328d054fee96897f798ac/6092997917.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/kapuza.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/rifevibadabagafamorudodet.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/metaropidosinuseji.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ranetep.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c41c5b24b14bd1bb30f025ede1dc1883/87936928607.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/45210314618.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/lexabewawisibowisajazu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f4fd298e---memoledepogawifarusagoju.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ca9eab74bc9ffcb9e50f880d9e30afb8/18381636088.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/814149f168f5de298066e233f7bed9a9/sejex.pdfIn 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://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_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 16788 bytes
SHA-256: 3a22a4e37c99dbdd9477697b7d51cb125bc1a755e62d95fae6695937da9e58a4
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 11024 bytes
SHA-256: 51bf5a7ce0a1b4fff4b1f00cf16f94cbbe6a339f95ce8c49a8019409e4182046
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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