Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee740d6de7953c80…

MALICIOUS

PDF

79.4 KB Created: 2021-09-24 06:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeefa63c6a1dbaea3d9341653ec47b9a SHA-1: 9c3413be55a849a296e58d01e738698db06b3a29 SHA-256: ee740d6de7953c80459bc621c26742eed07df624ca5f5d24d56ba809735e93a1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload directories. These links are likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=watch+the+morning+show+putlocker
    • https://thefencedocumentary.com/adminfiles/file/53322546414.pdf
    • http://gintaras.cz/userfiles/file/39851850583.pdf
    • https://kanat.com/upload/ckfinder/files/67149932806.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0cccb4a8---21162598236.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/92395961619.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/75882904198.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/boxag.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395299a1bd1---mewixujafogorulib.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/mumomerikakutadelowiz.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/91495534812.pdf
    • https://pbpkrosno.com/fckfile/25028639231.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/2690343332.pdf
    • http://gourmethousemacau.com/UploadFilesfile///tagakugiwipu.pdf
    • http://stavebnevyrobky.sk/www/upload/files/35845021553.pdf
    • http://accapierre.it/userfiles/files/jovajinejajadikesopup.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b898e06f5d84d5e5a4f53cf93fc6b1c1/maburusepomemimesudumuno.pdf
    • https://twinslock.com/locktactyuma/userfiles/file/87237087777.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/63211567867.pdf
    • http://norilsk.torbay.ru/images/uploads/file/55460232079.pdf
    • http://laskod.hu/userfiles/file/sikotopiz.pdf
    • https://rimi.sk/userfiles/file/vokukakidel.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/s1jo24vpm757it6soqnr90s2av/tapugejiderixewigudupox.pdf
    • https://skiclubraonbaccarat.fr/pdf/takuvakeziwukoxagidit.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_off0000cf58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 16792 bytes
font_01_sfnt_off0000e76a.bin
5c93bf7a87eab00acf709a557c7919d26c8d43da059d10d1deefb4ea850cd70b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 18144 bytes
font_02_sfnt_off0001168c.bin
1162013efdc6d58bf83e8e53879ee6ec2e6335b30d76ea92a307e692b8b9e5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 11092 bytes