Malicious PDF — malware analysis report

Static analysis result for SHA-256 40912b8fde6ea01b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 12:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fa63caf7fe1ecf67c3d3b5dfb22af4d SHA-1: ff136f4ec3fc99646c7dd575615d4d1201826e6f SHA-256: 40912b8fde6ea01b9c3d2a27798b5c54fce2a11c7bc90acdb8ea21f85682af32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to numerous disposable hosting domains, many of which are compromised CMS uploads, suggesting an attempt to obscure the true origin of malicious content. The presence of a URL with 'utm_term=garmin+android+download' indicates a potential lure for software downloads, which could be malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=garmin+android+download PDF link annotation
    • https://ski-valloire.com/ckfinder/userfiles/files/79373396110.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/25650402310.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/wasagozepexezivubekoboded.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/653d615dfe7a29a56159e829aa54a216/66797879909.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/5435606591.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/penegepoberupexeti.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/65e6abbqe6tmluvh2rqkjg73j6/fuzatusasarugibezoxat.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161367e6d67a0c---46625808510.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/45968083432.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/42166443846.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210917_FA606FAE38A54AC7.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7b8ba815---15426983093.pdfIn PDF document text
    • http://ranch.pl/files/file/ragesudodotezizozekaroz.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zonovolomokezimifumap.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/69481662871.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/853318814.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/nagegunikujupaze.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/58864789918.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c57a60b7---18361855372.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/murokolidixowid.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/38196614035.pdfIn PDF document text
    • http://namngonviet.com/user-/files/51068091662.pdfIn PDF document text
    • https://ms01bet.com/contents/files/putikita.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/92294455149.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_off0000b297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 16064 bytes
SHA-256: 7c282da7e8e185f4af0f9273b239b366c9dafb62c0262010421396cb8a7485e1
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 10136 bytes
SHA-256: 513a64df4a8e19d5e16044cb6f9912cbc49bbdd3ea8d49535743c055189d225d

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