Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cbb932905edb5…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 01:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73918fad1e6abab8afb22230b47ff8ba SHA-1: 9e82cbb47dcafe8c15177d66eddc6e49ce5e5acd SHA-256: 2f3cbb932905edb5b7d25e9b9fa6b0ba6571d92acfc2d7cfe56af580e6fc39be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The embedded JavaScript stream and ML classifier further indicate malicious intent, likely for phishing or malware delivery. ClamAV detection confirms this assessment as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wastran.ru/uplcv?utm_term=mood+song+download+mp4 PDF link annotation
    • http://orderleesushi.com/uploads/files/35497149166.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/soxoj.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/79465870201.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/16605385488.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xopibagad.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/sines.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/84511499940.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gagunonegazux.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1dc845bd---timifo.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/gewonudu.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631569535.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ranisajekujowagabig.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9ea58e7315552d09e9878fc22a0d39be/80055518936.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef6b3c12c---82001720409.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/34416713489.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/tulobolepajetufofaguv.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/64535728200.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nanixuligabosufeve.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/79080783296.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wamepuxo.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6742982323.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/27240163765.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/49927581822.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/80986086675.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/jurepupilajuviraropun.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_off0000c67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67B 10472 bytes
SHA-256: c60105980a82de5da2935e85d77abd6db37ce936a348f6835f9dd23b3a3665a4
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 17608 bytes
SHA-256: 12916c6d1f57047f09cf4afdd002757932d4a1549add60004e6bb3d25d6a8906

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