Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebec1f29a84a904e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 16:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e048e4bdbddbb6727a36ff3bb2d7f81c SHA-1: 282bde0070712754241a6ecd0c6a4056ba86900b SHA-256: ebec1f29a84a904e070569b1948c7ff5102ce3e24737e5aa4ff9003146b1f949
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a campaign to distribute malware or lead users to phishing sites. The primary attack pattern observed is the use of a link farm to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=isosceles+triangle+perpendicular+bisector PDF link annotation
    • https://associazionedynamica.it/uploads/file/dilenejagur.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/kepapetire.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d7308t64de70k9d5k8rupi8vrp/50015134719.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/31276cac330e50107870c64323712627/jonenusad.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/35917082485.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/69390140904.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac421fb23d8---xoxivuzoruvigol.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/12837121438.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/f90f62c1c88171b2482ccccdb65db388.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/odf3c0kajtd0i3sqvq7icsc0ip/wejux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b483d77cb---moleloj.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/bidazafibizusumalemuvovex.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/800722174.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/bevokaduxufexewirobidof.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/70fd2f64c82e6ad4609e38049fa250ff/xevuliti.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea2765ca52e126978f5fad0895af7568/jadafudelu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zokazokexovuzudulur.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9062e04f3bfbdebbca0d5be3f0912091/12095837324.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbb6ad060---45584082255.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/74344332904.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/baf6f8a94b47838ddaba4259e82205b0/46661926969.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c4f726e5d343c28b5a18819963da4c93/fenamumerenatanap.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/64482990365.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/savafedowowebu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e5664651f4d86a813857877477ae00d9/57578647458.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c749d8ed9---sopesetinitafep.pdfIn PDF document text
    • 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 18856 bytes
SHA-256: 21177db04f5400e16567689bd9025378a2e57491be8ed76989fbfbb99b40aef2
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 10880 bytes
SHA-256: c301cd6cfc75607458001f6c049d2a5711d787cc62e8a08001afa2c288085e4c

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