Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e50a7b37e8ebe47…

MALICIOUS

PDF

74.8 KB Created: 2021-08-26 12:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25d80209dadefa5780d5e8d63b52782e SHA-1: c1263991a3a38b2560b32ac8cbdf6bf9bf265a38 SHA-256: 2e50a7b37e8ebe471f7919804f60942ea884973c16828e22314d5bfb95d205e8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://olympicwroclaw.pl/zdjecia/fck/file/68553156797.pdf In PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/savivi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6c0aa083---61625081599.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc99cd7a4---68426351902.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/87274851696.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/825408010.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zekolususulagevutevi.pdfIn PDF document text
    • http://gloexdr.com/wp-content/plugins/super-forms/uploads/php/files/4ec434d225ecdc51868693833b162b01/jefinesuririjit.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wapevavul.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sudaxaferijasolarunoxap.pdfIn PDF document text
    • https://carlojans.com/cms/file/zopivogubafaz.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nesaz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f8d85e16---gelorilujovazaginorizovib.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/fudifozu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/40a4c8e5c1a3b836acb7ea87495a8938/zamala.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/pinakerala.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/norud.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nvelh46poplu0lap7ve57qinp2/bijopobumipu.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/23199799294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=arrive+at+ocotilloPDF 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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17408 bytes
SHA-256: 8605360b05628bad2fbf7aad185ead7811c8001f5609fecba427c7686c37a383
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 10000 bytes
SHA-256: 3739721717551d4446a93b925c183554d03cf8edd2d835ecede2231dd9a84d3f