Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce599d78a563a345…

MALICIOUS

PDF

91.5 KB Created: 2021-07-16 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fcc16ec5245fabde3848e07518370b4 SHA-1: 717c14ea88bdc890c7bc2296ca11a7fa631063c8 SHA-256: ce599d78a563a345d518b96268bb080a2fb15c5c0dafe7fdcd0366556c3bcb69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d7470991---jebom.pdf
    • https://arzhosting.com/calisma2/files/uploads/xukufobumofa.pdf
    • http://rheumatology.institute/upload/content/file/norotixamene.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f9832e0fc9d6bb3f2d9fe52a69f799c6/94069873127.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f95859bb8062df2d30dddef4ef88b7c9/rokokurupedigesevavutu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608072c03edbc---80362063478.pdf
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210705_163737.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a31293f2009---4234581237.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c986dc6cd5696139a84262eac3222fb7/ferapefemot.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b659422c655---97396825445.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc79a49202---vixetowabija.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1jvlvu18u6664nbui339hsp417/49272446783.pdf
    • http://g-shocktou.com/user_file/file/tazinofatoj.pdf
    • https://latework.cz/soubory/guroboletiroz.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/66539851250.pdf
    • https://cutandcolorparrucchieri.it/file/69059705942.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609449ad4701f---musofefenumagu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48e6b04f1---76011708925.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/pijpjnpr0n9rq4bc27q1qvo2qg/vunuru.pdf
    • http://jhdjt.com/images/upload/File/84273173883.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d190ac5219---tawixituxawikobiti.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce6807d9a---xorukomegilunodi.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9083c5942119c96fc9977a70d4acec20/sotevofedaketokinujofim.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4cf723fad---25334767504.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/80379a0c8e1668144a408e2fb5618feb/bezigilunenepix.pdf
    • http://daehwa.info/uploaded/file/fopetak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=citation+in+chicago+style+example
    • 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_off00010286.bin
1bdac81fe0af7c8cee25070e3bc8a6017b00cc069cd813f4ae6c12a3782d704a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10968 bytes
font_01_sfnt_off00011bdb.bin
335c3a74b8bb3c642f0c36a5961967dca03a89a3925ba662e981cd69ef7e4a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 17164 bytes
font_02_sfnt_off0001489d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 16792 bytes