Malicious PDF — malware analysis report

Static analysis result for SHA-256 4793a4dafe1d80cc…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 15:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 834d876c131858644ae708867266234a SHA-1: 8145ee62feb9348e7a9a930b6c0ecb32997c7c79 SHA-256: 4793a4dafe1d80cc42c63a49121164a4a60b98f8f709bad5b6de9f177d829812
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=best+apk+to+watch+live+sports+free PDF link annotation
    • http://ginzaoakland.com/uploads/files/lapamavebifuduzigozu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/12170341326.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/25630159789.pdfIn PDF document text
    • http://e-hematologica.com/users/file/fabexabepugixiragaluve.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nopavenoxuteworiwafave.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ram128u95oarc1726sr2ab0ode/32034790379.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc1a50f6f---37055013096.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/vasezuxoxupazuruf.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/mojulowujoxuxufexotatev.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/10476437944.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161399413d6e3b---2712343611.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/10014999380.pdfIn PDF document text
    • https://marosme.ro/hirek/file/91464539444.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140baf9668e9---96932297013.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/muwefetizofotivewa.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/7165231390.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/14807514416.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/tumefekodilobifi.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/jozirikazakokonelop.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/4059997535.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94019602393.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130995ee3ec2---35790900538.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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 18212 bytes
SHA-256: 90991bb52388fd3b69c8b297e0d04ccbeca618183ab59e99f9daf4eadd925276
font_02_sfnt_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 10772 bytes
SHA-256: ec219ad83cee92921a23d7f7ce2cc95185feb9ccbe52c629f853f604b4842ea5