Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1864d0152498983…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 09:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7fa35b0b6f51ae46fc17eaa43abc1355 SHA-1: 4895dbd9a398d7adcaa11675c31fa9ddf094a145 SHA-256: a1864d0152498983ce96ceb29eed359f325f58ddcfa76c04d4280796d57afca1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple high-risk heuristics indicating a credential phishing attempt. It impersonates iCloud and uses a lure to redirect users to a malicious domain, likely to harvest credentials. The document also functions as a link farm, distributing links across various domains, some of which are hosted on compromised WordPress sites. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=how+do+i+restore+messages+on+android.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+do+i+restore+messages+on+android PDF link annotation
    • http://tayles.com/uploaded/bujoselubepuw.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nalurapiw.pdfIn PDF document text
    • https://mangallagn.com/images/file/fojazumomaxoz.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/39161454281.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/30259104181.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dutilate.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemopizixowaxixas.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdfIn PDF document text
    • http://mobil-tech.com/files/55185978492.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356249dd2e9---44475847200.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c182146189---32449772481.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/befedovapariwewudi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e2bf74dd27b5669ad4cc554ee754d732/49689965629.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/16322286505.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b3429ee9434058b8e783f0b82184ca97/60074605010.pdfIn PDF document text
    • http://cudicio.it/images/file/12207105337.pdfIn PDF document text
    • http://dd-eng.com/files/files/3396232794.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/lafofajefevepenubo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/35272136275.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcd2e6c43---didudigavarafukebiper.pdfIn PDF document text
    • http://skene.es/userfiles/file/56478300095.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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10620 bytes
SHA-256: a529f2f891cf3ab8bc9485b40d0fd116a9c886d12c9e22faed17a05797b41b7c
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 17844 bytes
SHA-256: 3876ef1e7637561320216b18ff7da4b8e435a470da23c66e9d55f184952dce08
font_02_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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