Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8c4a614a091f0c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 21:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 262bd54864b1422bdcedc0b2f4ff101b SHA-1: 9ade753ed574e114363472bdff792f6aac924e66 SHA-256: dc8c4a614a091f0cb4c22862d3750ea6013dbe943a750b0fd25808904f59dc33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links to external resources, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the intent to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=pattern+magic+book+pdf PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160962cad6e9b2---jitudewo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/12407226671.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e523b002a---wujumetite.pdfIn PDF document text
    • http://zxsolar.com/d/files/xukutetujutuxemibagerof.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/jujalogezej.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/89408354251.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609833960638d---239509443.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/26987046f6be46cc3890b6f92fd296c2/tuzusasapoke.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/rifopebijunufosiz.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/50901778473.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/53418644755.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3e1e0b2d63d5fdb2797c85a37c88e14e/62022713295.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/minojogonejexofir.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/busodinadefe.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/sobajoludemepadebad.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/88022818272.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/47d27981969c094adae0c024adcd081f/25420534905.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91199929264.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/52635493131.pdfIn PDF document text
    • https://actorconseil.com/files/file/52991310786.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuwovakezadewimefe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6172b1fe55510251364c32f762a436cd/fidezan.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0c817c15dad9d2e2b5399999d878e90/fomuvoxipadukinorivigu.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 18808 bytes
SHA-256: 5d0122d20453a62b1a42c68981f155d9d7f612dcc6c576f490ddd204bf37a032
font_01_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10984 bytes
SHA-256: 652596f3bd95ea03c00c2dafed79fafa0da0308a461fa365409fcc78a6d9030f
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1