Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6d2a288540a841…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 06:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69cc7bb3bf9a37c710087d85eda1a979 SHA-1: d1a4dd05703b51ed75b1da0b9bff31321f5a5ab1 SHA-256: ad6d2a288540a841331b92ee6e60ed9298aa227be86d1238303489bcb97829d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic firings and the presence of embedded JavaScript strongly suggest this PDF is designed to exploit vulnerabilities or lead the user to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://philabc.ru/uplcv?utm_term=how+to+unrestrict+a+word+document PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16120b19cb3d13---gizejoripigomofibosopijav.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/nujitetelofuteperasomek.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/89758513062.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tegixurezomevogasabizip.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/xetiwovabirajilutep.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/49280055752.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4ece07f09423180d340b2f0382eff7b9/xegaluboxi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb90f82540---2550490883.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/bujejugabelotoxumibidukor.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0904afaba---liwitubodopiwubonakajaloz.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/52564902294.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f57109cceadc5eb9c9cf197ccc0f4213/tikofavezutumusem.pdfIn PDF document text
    • https://migger.dk/userimages/file/miborukaperuv.pdfIn PDF document text
    • https://dineflon.com//files/loxubesokugokutupitu.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/pasupuxenosubufosow.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608196e76eb8e---jasegimop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ceb3463367a61ae075c4a2c766571619/rupowedatexojaraz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pekogilinigogupovukamebu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfb74df64d---rofobeneseda.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108d234972cd---kigopapazovesogatu.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/jijiradiropewefalezeje.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a082c91---gokodajifum.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/b9d12a33cdf9247144d75bc274243057/gazuruguzetuluposafizuxob.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1baf2f1451---sagutajofozesukofipadazi.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 10664 bytes
SHA-256: 08304871d6a6be447c2f6666a8010ebd7c469858925885f0f0c61449fb5f9e05
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 17768 bytes
SHA-256: 0018081cf2c8851d421864f6e5d94b0b830c2650087122a405699181ade0fd4e

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