Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a58e3dc2a040502…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 21:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 144648b62e7c824af105c895805190d3 SHA-1: bcfbebe507d4619d7c8ae5b2fb8efb5102ba38e1 SHA-256: 1a58e3dc2a040502864554b4a186b63a3359bc7e40691a00e1d191ae7eae5c4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://matao.ro/app/webroot/files/userfiles/files/damejogebuvu.pdf In PDF document text
    • http://robertoantoniz.com/resources/original/file/nuwabumanifaset.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7e332103---30399080884.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zefoxoxel.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613591924cb73---40062697575.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/tanomamajuwegivaxu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/61341690091.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132eea5cb6dd---foxijodovikinaxofitome.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/98369626516.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/76006099563.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1c16ef99f0ec3ac2228c07c2796604d3/82207813248.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210912022247.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/17211344960.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/42705249756.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/53579135894.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/40100051903.pdfIn PDF document text
    • http://fabtur.ru/upload/files/solewugufitaviwo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/88081007690.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/gulidujutakozodexamuliz.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/8512189531.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/34273656558.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/pozud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+ds+games+rom+hacksPDF link annotation
    • 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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 17920 bytes
SHA-256: 0c42c6e61ed22e70d8b661bcb2ddba366c294333fd4e57eaff09e18d07158bde
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 10672 bytes
SHA-256: b8617b5a4b2cbe64a66cf1d25eba0c2c109b50cf1821798dbf10d23d91a78ce7

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