Malicious PDF — malware analysis report

Static analysis result for SHA-256 858b8e91412b9ac1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 19:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8d1f89d198fa960c46d77a7a9077f12 SHA-1: b45d8b7bc3c5bb13e04754bccb610228ba8e63f4 SHA-256: 858b8e91412b9ac1343f345ca4c3980b6ab69df496b64356308b1e52f4e363b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm nature indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://cuatro-pr.org/sites/default/files/file/44865290091.pdf In PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/38718843292.pdfIn PDF document text
    • http://afro-safari.com/upload/files/85452809032.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/16d3f431d1e8b308be9ce9f8cae3e08a/tofeviloxotisimebigive.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370ccd78d71---naniloseneguxuxigisifine.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ef84ad26---79703814670.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3e9420c---54765957333.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135540fc2b97---21290792685.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xalozezetekirimalamu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_390534BE1CDB0449.pdfIn PDF document text
    • http://kralpin.com/calisma2/files/uploads/zukodedawedodevu.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/budakodipomotaxododuw.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/98915495521.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wisavawopefo.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/84883717139.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54943130457.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/25836298.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/21525319874.pdfIn PDF document text
    • http://levotst.com/uploads/files/pewatutug.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/kijatatedozagedisa.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/26369740560.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/71462827158.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/fefina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+root+your+phone+androidPDF 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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 16580 bytes
SHA-256: 8378c7721ee576ce7948a0841c40136549aea537d0092ec815b661da9ca11512
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10568 bytes
SHA-256: d0393a2473161ad5f304ff6d395455f2886a6f5755770d8cda21b9260fe2bdbb

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