Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee834f5a88a5eb14…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04168b1b54d4ac364ee08b70feb2511d SHA-1: b6b517e2ea67048f75fa167bc34bc8bf06980e02 SHA-256: ee834f5a88a5eb14205e57ce33ffc975973c2d46bc7c145559f9760f5934a607
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=cara+buka+file+zip+dari+android PDF link annotation
    • http://annabarons.com/files/files/80282134395.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/ladufexozafimede.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/tifegixez.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/xejemopenija.pdfIn PDF document text
    • http://ndt-ultratech.com/files/21241474759.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4cb27550---48002745424.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/ginunewametasotidig.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906172741.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e150a48bcd---30578979354.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9e85adc---77308661237.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210918_C09E8C64C2DEACFD.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/78104826846.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/41940146594.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/jigovoxewipuso.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/kafazubotabe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbb741b1c---nosaxetibel.pdfIn PDF document text
    • http://client.diffuse.info/files/40648035421.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6eid9608o6br8hddjg4ovipa0f/pepimimejiridekoguxe.pdfIn PDF document text
    • https://nevisnews.com/userfiles/sudevak.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/tuwujufozu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/gusafubizemivawipe.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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 10648 bytes
SHA-256: c737d61b4ed51f112df8dc16fdf339149f25d7b2fb5d8997d289d77210f1a794
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16904 bytes
SHA-256: 9aa9f6afb5bedbf752852f33729c122ef56d5bbb3225e7b6f6907c1304975211

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