Malicious PDF — malware analysis report

Static analysis result for SHA-256 861d69895c83db87…

MALICIOUS

PDF

101.4 KB Created: 2021-08-16 19:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fee97f307d31dc225c72e72294c941f SHA-1: 3808cba53cf82dde7f4d9c6e656b9a0c7f01bd5e SHA-256: 861d69895c83db87d3dbfc63b250fec92bc10661b671fc038fddab00b0f73968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=how+to+tame+a+wild+tongue+summary+sparknotes
    • http://22743333.com/userfiles/files/41021413017.pdf
    • https://advantagelic.com/singhania/downloads/file/widaf.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af23018685f44ee6c68e17e8705eaac8/wojirujegam.pdf
    • http://tandartsindex.nl/images/uploads/55060240322.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d159353d303951af7cf3fd8b5d5a309d/xevexezo.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/zimuladuterob.pdf
    • http://amctop.com/board_data/editor_img/file/202105161406.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f190b4739---1647461309.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c9304624536bdebd8ed922cef691e843/jimavekojonubebofafakow.pdf
    • http://mosvag.ru/img/lib/file/30485760452.pdf
    • http://matsusushionline.com/uploads/files/simujevevipamaf.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08072de718---gabevajopobotoxovunadoni.pdf
    • https://dialogueinpraxis.net/files/docs/68514894033.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7ad2ca50a9197915c863a15441c9eff9/5626225985.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/wazunasimitobuxisuki.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pasofazagutosejuboxove.pdf
    • https://hgb.se/filer/file/38899799647.pdf
    • https://dycmc.com/DATA/upload/files/202106171013319461.pdf
    • http://parkhighclassof60.com/clients/871169/File/gosiladejivevon.pdf
    • http://landpas.pl/upload/file/60359435539.pdf
    • http://boilerservis.ru/uploads/files/gezavobasirazolub.pdf
    • http://hanasushimenifee.com/uploads/files/64590967883.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb98ad751---nazajutetuj.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecfb8b4a38c6daa895f138517dff2e9f/31996387901.pdf
    • 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_off00012502.bin
b801e05e673d61bb04a27930c2909c9cbd468a8b34e3284cb73d21b1328ea597
pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 18356 bytes
font_01_sfnt_off0001541b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1541B 16792 bytes
font_02_sfnt_off00016c32.bin
8c4a1d77cb5c0a3addf622d2be1689a5b709895073086a36a9f815f807613ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C32 11120 bytes