Malicious PDF — malware analysis report

Static analysis result for SHA-256 1949d789de9b3954…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 19:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05e874d1138f0c004d674a2ac042951b SHA-1: 4e1a69cfee117e18ca3ad7464a5473997365e5fa SHA-256: 1949d789de9b39546e88d1338f59f32bccd9a6f7701f711f868a1c70fc43d36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://garglob.ru/uplcv?utm_term=list+the+colors+of+the+visible+light+spectrum PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0a3b2ac8---8824839538.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/munered.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/rozavisiradovuwisagugozi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/73672022353.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/88737992107.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/menupedubimawasapizoles.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbfec5954---mijirutikonuja.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/059a998dbdd6a0a6672ee6ed04f58321/kesopewegaxowusavajulewaj.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d38a34ec---63620718213.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b5cd0c396c8c6bdf642b3a58c211d42b/timezirovaxakik.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/51835478648.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/koboxagoduna.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffaa0a6371---tajixufilonazebevatiro.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/lawolijufu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816612a8468---27492284240.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/72125207950.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gj90hbik1k3msuik6lbnsir5td/42525348959.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c662fd3549d---sudofijajusevutimobalusad.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf747c63f2---fepopolaku.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/237c26cc4a441d58171c153368921170/defop.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/87710a9e2f50823d310b0437206f9597/27344160314.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3883b7b2a81e994a5f12393593769dad/venibumeroj.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fa145d68e0bdd902550ad2d5cb77746d/16353441105.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16620 bytes
SHA-256: edd16a51e69c8d21cb770f82514b46ea0407115b53a39542c56685d17c40f9a8
font_01_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16384 bytes
SHA-256: f6e3431b3d13d45829f420cfd7aa892ac76e07a456b12580803bc6bfc48f2428
font_03_sfnt_off00014ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF4 10924 bytes
SHA-256: 6190c0ac08a032a2241c71a14208f6beea581a146d5a91ca66ea61957a3a1fcc

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