Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f6f14a6e75ab4e…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 01:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1ba98d5f53b7ad690671553fdc15f7c6 SHA-1: f8ec5698d7a560315802b88f80f5c336a64143b3 SHA-256: 19f6f14a6e75ab4eb26e8d98dce3e88f310bb603ad1b736e95e5dad1b56ea6eb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites acting as link farms. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic indicates it impersonates Facebook, directing users to a link farm that ultimately leads to a credential phishing attempt. The embedded JavaScript likely facilitates the redirection or obfuscates the phishing mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://cructi.ru/uplcv?utm_term=star+codes+robux.
  • 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://cructi.ru/uplcv?utm_term=star+codes+robux PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0626f3e2e---xusinepotinisawube.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nn7s2oss7e4jvg1s9i5s4ggpf4/78812925296.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/h3tprk8mhc7qqs707d57520bl4/23311682410.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/xeluzuwasokorilit.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e519702596874035680a0cec2dc9010f/27900217031.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lorazajuxidenuwerunesego.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0cdc7d29---fonivoziv.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160745ec74c941---karewisa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/28275967738.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c115a5e7630---2459418865.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/17jts1d9uocnl0kojlf98so2fn/83426832248.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dejiboviga.pdfIn PDF document text
    • http://prmakeup.com/Image/files/24538237488.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077837d8a3a6---94682939456.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/81999582757.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b538003da6---gototi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad23158606173dd9b28e6d87d36ea075/vozixutabanogosulima.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0be798a0c08528093ab885e564f86b65/68072987797.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ud0nmotrcm3ga80ja3vtj6h5cm/24024009009.pdfIn PDF document text
    • http://haphadoor.com/upload/files/97578005156.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607861e350f97---gegibozu.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528140115.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18584cab4a---vuregiduninudedero.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_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 18120 bytes
SHA-256: cc4b8c272caf11d653e2a349001197f4897492dc794a0b9ab0eabbfdc733e985
font_02_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 10540 bytes
SHA-256: 35cc2b392cc0e4087aecf1fbbc89d56d9a7dacc9622ec10e169b19de2deace5c

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