Malicious PDF — malware analysis report

Static analysis result for SHA-256 20252e6dd9deefb1…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 20:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4afd24a8db76933b8b54b0cf65f5444 SHA-1: 96a2f42c2adf7994e69045908abcf70667eaaea6 SHA-256: 20252e6dd9deefb1d98e48fbfb0b8425a9172415c864fd2b04d41bb99168fbed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=clash+of+clans+latest+mod+apk+download PDF link annotation
    • http://murito.fr/ckfinder/userfiles/files/pobavofegesulukixemewu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/dipuwajusofazasumak.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515ed113c1---67592458087.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/luxagojagaminewazi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/034mb8crrm7jtnmtaktt51kg4s/jurisa.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/56271313630.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/12759044684.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/37434962324.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/22261528314.pdfIn PDF document text
    • https://bnovum.hu/downloads/xekejaledezis.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/veseb.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/96460385571.pdfIn PDF document text
    • https://tl-systems.hu/files/files/liwuveb.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/87640113162.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/58534424740.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/93b69818c0a088b3cd6685e172edc598/63250909943.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/limarem.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/doxagizodaxalipud.pdfIn PDF document text
    • http://patroha.hu/file/katosixesezutupabubotazo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kazivuvulugufujosilesute.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff276836d---9739984012.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/najunobeb.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/falumedutovapetowedomi.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/jojivesutaf.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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 10904 bytes
SHA-256: 902549630514b564c641d5e893adb4754c89e12a9750d93b023fb04f4306375b
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 15900 bytes
SHA-256: db3a12848d2c35c724f6727c4982fbdb928d8f32e7072e3d2f0615c5ad891abf
font_02_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1