Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25d3d0d7cec43fe…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 09:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ce3ae12e0955b6ff419bf10b8b57fb84 SHA-1: 3f467d05f89d2e01880d49a84d1a13444473146c SHA-256: d25d3d0d7cec43fe4ebc44017d724a95f70b0bc036dcfbd8c12f1a3394ac9842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and heuristics point towards an attack pattern involving malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ketchas.ru/uplcv?utm_term=a+downloader+app+for+android PDF link annotation
    • http://challendor.com/fckeditor/upload/file/48514591643.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/wigijamatakipojorigi.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69053525039.pdfIn PDF document text
    • http://recrute.fr/files/files/jadutoxonuropupulutakod.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/12794485973.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/12140882845.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab9e334de---60468897298.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/kanog.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gowapukek.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofimowasopolozib.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614122df967bc---2614163408.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/17551771115.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/bewejulunanamopekowuma.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/75554874589.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/mizufajiwizitadiwizu.pdfIn PDF document text
    • http://thepducphat.com/upload/files/86115119705.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/poxawo.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913519343752.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145def616661---nafali.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/40961477567.pdfIn PDF document text
    • http://kco.su/userfiles/file/54612589779.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/karibepesu.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/xiwaluzabefit.pdfIn PDF document text
    • http://innersolutions-uk.com/file/busaxewel.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/29371175823.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/26038795179.pdfIn PDF document text
    • https://lapdonline.org/file/bofozopatanoni.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_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 16708 bytes
SHA-256: 784b93dca063e6e52b8dbf5220e07f7fa4cb911cfc1b6c60f498242acb4681b2
font_01_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 10292 bytes
SHA-256: fac81cb40b0ff9162fd74c296ce0d876dddcd40175b89db1c54e7edadfd7e57e
font_02_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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