Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06e44942d0814cd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 06:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8618a5600d3fad650a4f606a61463fb2 SHA-1: 156242ff3f5f9916fb5eb388237b9dc8316844f6 SHA-256: d06e44942d0814cd2fb1c398343b6e43e4586095b117a79481150a277d6b151d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161155e2ccf336---seniwetobotanu.pdf
    • http://dmhu.eu/uploads/uplib/file/datetamogenunusujuwala.pdf
    • http://worldtile.net/jangheung/userfiles/file/91383284487.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nojotujasume.pdf
    • http://atthaya.com/file_media/file_image/file/67691426690.pdf
    • http://ccswcd.com/userfiles/file/93201123375.pdf
    • http://karpatskiles.ru/store/files/wuzaxozikites.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c9d0e830---91854625850.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160795e4ccb98d---nobizesaxikimununepo.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8f361087c79b14824a49f3eb83bc482e/fisulonepunegigujakejuge.pdf
    • https://shop-ecobati.com/medias/upload/files/rituvafej.pdf
    • https://justbuymeds.net/userfiles/file/28532027962.pdf
    • http://technology-mp.it/userfiles/files/89961692825.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/m4uh8pllijh778ng4q7q75ahbh/xevogosudafumelovoliboj.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a73fce95803ce94e5e13abb583823fc6/91845896767.pdf
    • http://prosquash.by/data/jedizopexejorikoriganiw.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ec101d2b2ea486850acc555181069064/61631879052.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb36b6b57---zobezokanej.pdf
    • http://jr.ac.th/ckfinder/userfiles/files/logewifer.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0bb380b76c48633aa78c8073429797a0/xofuvaroniribuzewapodomiv.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wulisefoxavuwefimumakela.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074603921f78---90673181632.pdf
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/luwesatemipil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ear+blocked+after+putting+ear+drops
    • 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_off0000db1d.bin
c879e10cb1c97b39d6fe05c922bd56319e657268b83eeb4db29379f89f22bc72
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 11112 bytes
font_01_sfnt_off0000f4b4.bin
a50e40b050af9081a179c7083a7df226fc1f89118b913c588cbdd6ace619313b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 18916 bytes
font_02_sfnt_off0001246d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes