Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2917d3bc219b2c9…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 08:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: babd2b955176f728cfdf1faf329a9fe2 SHA-1: 535e8803905798fb01e0c339152f246ece708d4b SHA-256: b2917d3bc219b2c968e628f8b0f63cdd4c2024340edb0f381f9c77ee71052c57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ij4fv0mj9j3h7t3dabvstp0uov/pesolononurapu.pdf In PDF document text
    • https://ahirealty.in/admin/userfiles/files/doxisojon.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mobifaf.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/verezaroxidavulorazupumi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346fe2d7c4---lugagomaditika.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/gusoputubogunuwufib.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kuzeka.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc49454d2---69499310280.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/burirakexeveboju.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd39e9fce2---lexuwigoxu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091818130473499.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/lopubozew.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/mikiworolireburisude.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/sezebatalaj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wifujurated.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/66295721511.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/41411452715.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d8a5bf0c---rokofepoba.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/forawal.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/girukepokuxipetosi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b4a27f4f5fa3dcff7af1168d6ddea1ea/39911281539.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/43615120245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unblocked+games+bubble+shooterPDF 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_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 11064 bytes
SHA-256: b5c98409de5fd4b5a26f241eb48b8c948db164d73440c531f2f3de3554429710
font_01_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D2 17764 bytes
SHA-256: a3a4ff61488b72cc750507ca9d61fe94a934ba24c1b4a01492ad7cc3ca60a8bf

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