Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4a5ea47cdae38f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 07:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53ee827148ce13c63a3b37ee94c51c94 SHA-1: 32d6d318c78952aaebe0ee06e670e2b7d8726fd8 SHA-256: fb4a5ea47cdae38faa9db2fa34f74952e3101d5643bf8ec6cfa495bf3e39765c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pistant.ru/uplcv?utm_term=websites+to+watch+live+tv PDF link annotation
    • http://kcpsystem.com/userData/board/file/25457403339.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/famavulaj.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bopumivil.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/rivemabiri.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/boduv.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/magorotafo.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/lozibomokuzagezosuja.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rikalelilive.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/poxetetupa.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/11094439987.pdfIn PDF document text
    • http://vkts.se/userfiles/file/43572404223.pdfIn PDF document text
    • http://ciskmv.com/css/file/3563013831.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd1d16bec0---lenelovanobito.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tajedodaworimesefajepiru.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/8291353040.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bf9r686jp9g3b9f3qbc1appic2/vanabarudilegilereta.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/59525318329.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/safojifobujutodub.pdfIn PDF document text
    • http://uchid.com/uploads/file/99205670824.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/43137187256.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/36479257775.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/15021a44c638b1ae144c26bf4f9f2281/15650258460.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jarorotelewomidorobiboko.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_off0000ae00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE00 14844 bytes
SHA-256: 2da61020fd8d0382528a3cb9949e682d03b74992c2bf198e0623d19089a9c328
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10408 bytes
SHA-256: b8099759683b46a0ebf6d0210103c252ea4f4a6a71b209b950ced6258fe8b3e9
font_02_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1