Malicious PDF — malware analysis report

Static analysis result for SHA-256 798eda6319d5ff3a…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 17:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acea26ebee7cbd502b1f44849c951b5c SHA-1: e82c9d12db571ed42d7d5697811c5c09ed2b8499 SHA-256: 798eda6319d5ff3ac05f9caa0d0a5135850c31e35dbf6a863c7c49581c636ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://karinbentum.nl/uploads/file/rizatukirasunexugol.pdf In PDF document text
    • https://smartcrm.cloud/upload/files/60529545644.pdfIn PDF document text
    • http://lulanjina.net/upload/files/puxisafu.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/74680281861.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/41015183807.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386cd43ff01---26929290717.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/91956145028.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/semuwalurilizowijewiz.pdfIn PDF document text
    • http://falerisztika.hu/tmp/35496417435.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/23545800366.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/renod.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/22220618847.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd90ec6e50---bepavekesavojovi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139057434286---7872104260.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/61315658676.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/78662453919.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/19cccd504f9557c8f0058722c697836a/xajoroderabununexubadiduk.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/ratox.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ab3216be---32136873082.pdfIn PDF document text
    • http://philboyd.com/redawogavunewagupikugisa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rebarunujaporilosa.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/rozugow.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/gasevokaminifi.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/9156785977.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/samatexofu.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/6042214458.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/95107013733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=get+insta+mod+apk+unlimited+coinsPDF 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 17868 bytes
SHA-256: 6baf50e3c566d67fc9e25331c12a621cd54724e73d2593a37166a542cf48aa18
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 10804 bytes
SHA-256: 02ea85762c1a7781f07dd2d0de267623f75a4fd9deffbca54801662f36247ed4