Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a27be06d781230…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 03:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9da1a6a621447a091677bb36e69f48fe SHA-1: dc8254a8f81ae5be780dc263fa21539022e9d867 SHA-256: e8a27be06d78123031c99fe01a5d654a0263001961472d9bbcc247b70698af76
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of 'cmd.com' in the document text, alongside external URLs, suggests an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://drafthe.ru/uplcv?utm_term=black+market+apk+android+10 PDF link annotation
    • https://vatlieutaphu.com/upload/files/ridovapawisuloz.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xabevanomizum.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/raparakem.pdfIn PDF document text
    • http://qdcmd.com/data/files/46845728953.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/39782542810.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/46255067092.pdfIn macro / runtime command snippet
    • http://wsystem.sk/userfiles/files/20965068575.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3870f8a515601c256cb16c47d8ffd9ee/lasunojibu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff50f3ce035cfe12eb3091a51b7533aa/lebuxex.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zuvovizubuguwamimuzon.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/91108115780.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/81369124088.pdfIn PDF document text
    • http://17njl.com/userfiles/files/89375487721.pdfIn PDF document text
    • http://fxlcd.com/upload/file/dogat.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tobubikiwi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409d6bace8a---45856659767.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/77923020369.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/29735838615.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/08a87453ec26ea30cea4f80a6a512c66/japubiti.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nifadepabaziwaruvime.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/54784585117.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/bajevodoxixuxebuwek.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/52019629193.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xegajupazir.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/13368322857.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/tiwat.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/koxekezi.pdfIn PDF document text
    • https://www.blackandwhiteIn macro / runtime command snippet
    • 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10828 bytes
SHA-256: dd442126c51636c3746cf2e62bd962ef6d31f00a19cdd53a07f5544b77307e0f
font_02_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 17508 bytes
SHA-256: 0cf4fe5de56e8c10be5d4c64be6c16d96692761ab33003d493fa574f63c063f8