Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2832c960b926e6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-08 12:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c07866781b477fd28b66cb7adce2b421 SHA-1: ef03a6fcf1b68d5e2e156044d97f84f1f6addeab SHA-256: 9b2832c960b926e63f19c475ad6988fce3e42dbbe111c2a3e184263ea6cf6a7c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The presence of embedded JavaScript and multiple links pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fese.in/ienupdimages/images/files/19202630526.pdf
    • http://alhambra.kopanramen.com/uploads/files/50593497235.pdf
    • https://castel.ro/userfiles/file/77928428341.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161363bca80d80---64302951717.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdf
    • http://vako.vn/app/webroot/uploads/files/guwowe.pdf
    • https://marblo.ph/app/webroot/img/files/41796967352.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/28320312853.pdf
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/8080947832.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/36946465171.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/fcfdfd2434e357298371d818c6ae0a1d/47181825664.pdf
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/70174565710.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/rofakefunebukowuxozaz.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2d338434---26057887363.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/98592368455.pdf
    • http://yongqingtech.com/d/files/dibepitekul.pdf
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdf
    • http://rsti.biz/files/fck/file/maxapule.pdf
    • http://concilianavarra.com/userfiles/files/11156559375.pdf
    • https://truonggiangcompany.com/userfiles/file/zoroxepod.pdf
    • http://lawngo.net/fckfiles/pivekilid.pdf
    • http://naoshima-habitant.com/images/blog/file/4867491143.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/zopudixakezi.pdf
    • http://iglozawiercie.pl/zdjecia/file/63707876575.pdf
    • http://pilot-market.ru/new/files/file/60996874487.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/zesogivaruda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=multisyllabic+words+with+prefixes+and+suffixes+worksheets
    • 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_off0000b3e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
font_01_sfnt_off0000cbf8.bin
e23bc974e16bd5b03781fa928fb5e6f06d29d71ad3ca171216af24ed4ac57d6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 11344 bytes
font_02_sfnt_off0000e686.bin
9f087adae0660336cdf00cc621379d13db35c03311f0b0da141b8db29d6ce10b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 13572 bytes