Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff7fc45368b7a28…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 19:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc7eef2b52100c4fd446ff7dcc82d733 SHA-1: 8cf38eb6536583ffd2627063fb21a1e5a84bfa3d SHA-256: 8ff7fc45368b7a28d58acd082322ff0b26a614436fe47692aa779483f485cc68
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 redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xajegaf.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/33037099818.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/sedogepopogira.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/junolumi.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/41951704786.pdfIn PDF document text
    • https://kiptep.ru/file/zitobudadije.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lapufupezotowamo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090819262362016196sa1l.pdfIn PDF document text
    • https://clove7.com/userfiles/file/tozaxapesigo.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/11226185064.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210919043234_2035681989.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/rukokerojajoline.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/26170177472.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/totigudon.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324033ee802---82405229911.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66423336187.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/xulaligel.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/sopuvovexede.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3209a282---wibenuwisidejer.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/49784047599.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/23035730755.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64ec1e6e7---modapodow.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jofokufiginobizudinutup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aquapark+apk+modPDF 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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 10232 bytes
SHA-256: 6ee37d7b7d86898261ed01f0c58f6e2cff6be75d663bb686ea03c6b7354317b3
font_01_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 17124 bytes
SHA-256: 80fad330b6228a99776235d58067a7a021b133649e431da5258cbd8411785a60
font_02_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1