Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a99393eac138576…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 03:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0afeb9f4db05a1e305fd6f254d57159 SHA-1: 5e58e8ed034416902e8b7f6a9536e4804c10f87b SHA-256: 3a99393eac138576ac8dfab75533ef46cfffc4f039c5c77fa78a05d201a757d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aiming to trick users into downloading malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://3e3i.com/UserFiles/file///40905087225.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136950b53781---sopetila.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161458bd4dfc2c---64984190554.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/77234923737.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/3596584349.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147c80ea46c1---jedubepojorijudiw.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/46535309347.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/50388318262.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/8192112471.pdfIn PDF document text
    • http://machin.kr/userData/board/file/55010678787.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/vokitevezoja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/guwawu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/41159986460.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/93599774931.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60785899196.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/67975280061.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/42714326914.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/60803982821.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/32125954184.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/boxutigexajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+download+apk+full+versionPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/46477951285.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_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 10952 bytes
SHA-256: f9951abc068beb826fad13c76e4edf8263696d484d9cc8e089d69ae8900bedf7
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16952 bytes
SHA-256: 614e8511373a03a99f9a5d0d87b1c04e736da09dfbb72385791e5f999740f621
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1