Malicious PDF — malware analysis report

Static analysis result for SHA-256 df14bba676069cc2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 21:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78d8fa89cf51f54e2355044f686fa63d SHA-1: 96d2220d763a8b7433944aebc02a3e2da3bbba68 SHA-256: df14bba676069cc2e40ae4a1d03cc75a160959f9f7ae678da4427057bbf00ca5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a credential phishing campaign. It impersonates the brand 'Apple' and contains numerous links, including one pointing to 'inwebjor.ru', which likely leads to a fake login page. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a wrapper for a web-based lure rather than a traditional document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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://inwebjor.ru/uplcv?utm_term=glencoe+mcgraw+hill+algebra+1+pdf.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=glencoe+mcgraw+hill+algebra+1+pdf PDF link annotation
    • http://xn--m1age8bh.xn--p1ai/files/file/jaxexifoponajaguxe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094830f79c0d---fuxozogagigodufapanolutu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2e693ea0056977052e95f4f8244a0382/15311984844.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/67581368856.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/2340953400.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/57494799315.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/71152354778.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3900ae6b6291723d48633d754f3ef887/zujidagejopi.pdfIn PDF document text
    • https://zold-kommando.hu/files/jovatevuwit.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wowunajunazi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/52530529679.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608816db1f98b---neribuvanarodev.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/janukulafigono.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8cf1d05b217fa5d49c0f0aac15dd42b9/wosax.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/genivumitigiruf.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/17522471402.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/60956122892.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/zewejilod.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/60070f0855498411a09fa0ff211ac04c/50644345972.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/616a9dd19809e5ad68afa47207ea2422/41997280016.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/66223972979.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/62879417271.pdfIn PDF document text
    • https://fultoys.com/userfiles/33521608956.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/86708683192.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16289559581770491867.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/korosekuk.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wasifuwubigotanivajuxo.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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 11120 bytes
SHA-256: ee3a82a02b23f055e138deab2fc53eaeb6b070f780c5edcf788f175c7fe53d78
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 17236 bytes
SHA-256: a1ab947ae7b2dac1ffead8807b416d553df94001ca3a67cd7ca6ffa73089284b
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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