Malicious PDF — malware analysis report

Static analysis result for SHA-256 780fce567fc4fc8a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 19:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7392b10f6bcb595bf8a5411fce0d7dd6 SHA-1: cc39c5d0145120a25f2802dd0a003491e2cc4774 SHA-256: 780fce567fc4fc8a8ba7f5f3709b60eaec5628a0c852f9e26097e1066afff36c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ukmalayalamnews.com/userfiles/file/9371595137.pdf In PDF document text
    • http://keyday.ru/files/files/32543685993.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/darawijitipedazelepod.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/vumewax.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/wavijukowugagujizavodu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a051e7c24---63413652482.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/17765437141.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/1002122141.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5ad621eb---74090390813.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/suzurize.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/kegumexelilupupaliparoxo.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/revududomewobiminirikew.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/85456734183.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/wefiwowitisazezebepowi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/94041456057.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/pexidagilirifor.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090823335995.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zofidurubexukuvinabivab.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/wivonupobu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/riwowugilipitabatux.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/saxum.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/bogofi.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/18411399537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=montage+video+automatique+androidPDF 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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 10684 bytes
SHA-256: 66fb2899607977faaab08459e7ba77e773edffa1b88b1ea522760d37fce81507
font_01_sfnt_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 18500 bytes
SHA-256: c81c5cf2d647eddb617dcf06163cdfdb20e2a33926dd7ed112f32bc827986c19
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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