Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a9bdcd9521ab28…

MALICIOUS

PDF

79.8 KB Created: 2021-08-15 19:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18bc39f96203a48a3dd92171119cea86 SHA-1: bb21d313dc9bd03beb173c3e4ed4c2b5459ebb00 SHA-256: 72a9bdcd9521ab28ccceb5839259267a8decf3bebef2240c849676c9dfac6396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://atenngo.com/admin/sites/site/documents/81504363623.pdf In PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/gogomazegugigodipaliku.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b583abfa40---36160451564.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/38790669513.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98a37fbcf2be2558f388550c4a63382f/13582953110.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/finefaduk.pdfIn PDF document text
    • http://unseretochter.com/images/file/gusemomewone.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c831bcf0---30537678832.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a10ih3v1d3pk4tofqju2no2vi6/lejetisinavevo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7339c955c4---najeletusudodogu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/48451977725.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96307212513.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kejuwizebuvegapu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6475991492---97476905830.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/zorojenaxa.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fokut.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/96240971223.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/6711962383.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70957249856.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/257f65b075593d90647d1c12fa656dce/61401649379.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f63338d31d3---25171834644.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/275df745f9f8b92409a2e85ec913971d/raxamomuxesakodejefuraxaz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bekureduremezutivowun.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/genaximirimezepuseno.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/62106691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=historia+universal+contemporanea+santillana+pdfPDF 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_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 18336 bytes
SHA-256: 668d710071cd224e428238b3af9217ef530d4245341a04cca7ea5acb974c8563
font_02_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 10936 bytes
SHA-256: 01262c6388ae1ea56ad08b25335515b12f27511ac0b6ab8f679c0c4a03283c57

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