Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67b9a1410013ba4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-09 18:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da4643bff338434df57fbfb678cd88e2 SHA-1: b14cfeccf42d39a0960c520c36613e13ac9cd0ca SHA-256: f67b9a1410013ba46c7065095465a26d66e5eb6e8a91edd835a870776ebb085a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://chithanhplastics.com/uploads/userfiles/file/48178056705.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/tazaralenanabiw.pdf
    • https://songhong.info/userfiles/file/10976890074.pdf
    • http://salsainkonstanz.de/media/files/66184903572.pdf
    • https://satellietgroep.nl/userfiles/files/nerefawofefigevivedi.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/68442604506.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/24949808967.pdf
    • https://carsen.sk/editor_uploads/system/files/98160956228.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/faa193dcbc89ca1f7bf1a7e03e6a9d9a/gajerukelatakosapabureb.pdf
    • https://csmgh.net/pevron/www/img/file/zijuvu.pdf
    • http://lovesenergy.nl/file/60211887785.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vefabapugadokowosuderes.pdf
    • http://tantos.jp/js/upload/files/fazetufolijepupadebogexij.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b13d4a1f9c90848fe0323599af213ce5/volidofomesomedatu.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/56695650800.pdf
    • https://exam10.menapoint.com/app/webroot/upload/files/87530093426.pdf
    • http://ryanoomen.nl/uploadimages/files/xanapopuvagorogitevadi.pdf
    • http://automozg.by/upload/editor/files/timejavoke.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01507750d---vemeputemum.pdf
    • https://naucharts.com/ckfinder/userfiles/files/57710072602.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161347355b253d---wobinuv.pdf
    • http://jump360.co/upload/files/20210904075031.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/pojuno.pdf
    • https://ladangmimpi2.com/contents/files/4034567090.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0784573af---wufopu.pdf
    • http://langeline.com/ckeditor/upload/files/botopomininobirix.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/69140396276.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=temple+castle+run+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 16792 bytes
font_01_sfnt_off0000d398.bin
4d511cd56a5b1ba44a438cab4677a5b5e2a1c90fdcac552587fe0c501fa2dbb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10824 bytes
font_02_sfnt_off0000eca6.bin
5a3e154defaace603641ec09029b3896ee2aee8981b564be132f5b51d5cd1a4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 15900 bytes