Malicious PDF — malware analysis report

Static analysis result for SHA-256 b366f34c438aee10…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 14:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9997475fee4ea2408f71d4a3a73c3260 SHA-1: a6058cc78b1f5cd5af18198ef60fa013b029091a SHA-256: b366f34c438aee102d5be82808073d115551b509cf435c55e2f2697bbe8912d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://aaronandanthony.com/userfiles/files/48661831704.pdf In PDF document text
    • http://parfumland.sk/upl/gidawiratomurod.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/37713901844.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nukamanivolageg.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/03aa31e8565540cc33fb7456e370193b/44487200639.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pamipazadateruko.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d461655016---butesumu.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/09115204647.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/rivotes.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/757rust7o844l3lhkvlq6vjo8f/80771397647.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/75628491730.pdfIn PDF document text
    • http://njchemland.com/upload/files/surek.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210901_FD6DC9BF57DC29B8.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/27314910022.pdfIn PDF document text
    • https://renetravel.ro/images/files/dariperafelilojinusiba.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/81159027674.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tamozarekorovazugifolora.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/34460585731.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/87006394644.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/92629662368.pdfIn PDF document text
    • https://gdaniec.com/upload/files/kugobidifo.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54284177214.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/53662026785.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/85985603520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=comment+lire+un+fichier+epub+sur+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_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11156 bytes
SHA-256: 3bc2f07755a60b4a3ef3941fd0198286ffb0df63f4b51f3e00336033f0aa4985
font_01_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 19440 bytes
SHA-256: a1837c2794c75111adeca37ccae54af91dba55951f133bc3a5355e70594647e4
font_02_sfnt_off0001447c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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