Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c50e065e113822…

MALICIOUS

PDF

79.7 KB Created: 2021-10-10 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f8319522b42f2a5a3d08cc8ee945793 SHA-1: 78c6faaad904078fbdbe12435328c18be5ca7e16 SHA-256: 43c50e065e113822c67b40087d217ff89aac84d0a18244e3ca4440a4bd281895
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=knowing+the+nature+of+physical+law+pdf PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b3559aa379fe5f8b2ac9b4f6a0785683/7707151243.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/zerinowuxokogi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8d22aee9c1f844b53b0e819b28644704/46752398549.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/pijumovikawowoguz.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/saxevogovaxadaja.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152673b482ab---dijufijosonezuvajulume.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/60436102573.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/97175f48e4a744969c9f98f0c392a147/39081218709.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/zilefitegesigof.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/vixamisolirex.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wodev.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/wamigipenekuluviwu.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/lozijovudurakavugojat.pdfIn PDF document text
    • http://thietkevang.com/upload/files/88575207182.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210908_8B8367242C08D3CB.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/77193516554.pdfIn PDF document text
    • http://szpk.hu/_user/file/11094788242.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/58585238040.pdfIn PDF document text
    • http://gazetavk.ru/img/file/33157303102.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/332319934.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210911045920.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477ac5c34a3---refuzevemetopipudevude.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/noxatijifufagovagi.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/70984356660.pdfIn PDF document text
    • https://westech.solar-napkollektor.hu/js/ckfinder/userfiles/files/tofadowisusamexemutarisuv.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/98682011216.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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 11188 bytes
SHA-256: 4ce18e6e5a938eb101681d530dd7d59ae04d2834a30d6de9a3fcb9657971748a
font_02_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 19360 bytes
SHA-256: 218ac1af289a7087357a0254b1080dbf6d97af9e8a687fe885804f56b38eab84

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