Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d414b1e301c53c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 14:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1769d2a7477703948961f87df2521e4c SHA-1: 2a585194f54e15abec4f251590fb2d1469344f77 SHA-256: e9d414b1e301c53c50f2fe3851501596a9fe8824dcdb397bb554a06491f27c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

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://medvor.ru/uplcv?utm_term=android+app+with+restful+api PDF link annotation
    • http://nanumed.ro/uploads/files/10443981287.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/49272892708.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/74434075076.pdfIn PDF document text
    • http://snft.ro/media/file/15740302025.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/90866477323.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/3534312305.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zatos.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/faa193dcbc89ca1f7bf1a7e03e6a9d9a/gajerukelatakosapabureb.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091022515327.pdfIn PDF document text
    • http://cutskytools.com/d/files/mewete.pdfIn PDF document text
    • https://mar3ol.com/Files/files/molik.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd38fc45eb---jezajexumipatuwudex.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/53692002120.pdfIn PDF document text
    • http://ladna.pl/user_images/file/72501659822.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488316a43d---sisunevibageduw.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38215964849.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/54035576533.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20443857769.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16305538041727160916.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/33740096073.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/menofado.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/66974595792.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 18264 bytes
SHA-256: d73331011c508f444c407e58c6361dd6c1404b47636145995d43ee6887115fdc
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 10764 bytes
SHA-256: 32a6735166ce884134adc643d94b7613ddaff408448f01299225efd285607f19
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1