Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6a8b11b1717d75…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a0fe4893e98da73e942b85d3c8c4b7a SHA-1: 328b6de62efb2360d9166715417854223a4aed7d SHA-256: 1f6a8b11b1717d75fddb056495f23a177eab7cc62c59d0854eef37f0f11ad601
156 Risk Score

Malware Insights

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

The 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 that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://capitalsyndic.com/userfiles/file/rekokefonowubu.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/lidirupona.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dazuwenopagi.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/49292262335.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/81535558647.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/geditijafepodapinisim.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc40f505---59642580632.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/23678656282.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/167bd8b967fc37c17a900c2b21b51459/zodexavomi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939837604b---4203711836.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/25279151939.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rivabenuzeronim.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/d4a5f14de6feb629fdcd0ea0c82da38c/91106541951.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/xoxara.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/30016932223.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67265546446.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/leruxatekajuzuvegunufib.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/uopj5ib3qhk8mdhq4565hpg2cf/desoziwanikokat.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2d1b72c0d27ce4214460d52221ca3208/nezerikum.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/28316002661.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5bdd0c0867fdde424552c412eb1d50c/gofovixelek.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/12790521966.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/07d504ee85cd4f5dd74f4efad90077cd/fajizegezazusivojodetawov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=simple+heart+diagram+worksheetPDF link annotation
    • 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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 15820 bytes
SHA-256: 572741b5a1fd1d2a79c6ccab822b54c0417f66ffa663b94a29c89c92599e51e1
font_02_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 10988 bytes
SHA-256: bbb8f7298b273e16de743ae0f011f3e11a657a9c0a3aee5f1df2da9b65eb47e7

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