Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abed0d135650bb1…

MALICIOUS

PDF

113.6 KB Created: 2021-09-07 12:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b296c66df1e8539413ea5f8ec7b59e96 SHA-1: 17bbdbe3fda627971fd099ac4159249783bbff8a SHA-256: 4abed0d135650bb1d8ebfa441dbe340cad6273de0789a64412a7475bb9cc26cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=candidiasis+balanitis+pdf PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021061018412070.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/3325162428.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/20247926850.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rn2et0jo9hgujdhd65dq7rcsu3/lobixe.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c3eff75d2c781fff0c1d49086bf9fb9e/48546046295.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/91b40c34dbbca49741270b435d705c68/fipukodifebikuvedotiv.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/95402172788.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/30828884890.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/nurekenonafidokafigowova.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/4802215337ce08de56534ddd88111095/91977927046.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf1e27864a---ligorevalupizoluviwi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35824ac17---gilaviwovugaxuri.pdfIn PDF document text
    • https://areicon.com/images/file/72316356580.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/mabiwakikeri.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/96229164898.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6ec9657a---62673699337.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///28298577213.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/50168def6b19e963d8bb6ac9f4cfcf59/mutegiton.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/51374303454.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/51971912381.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/55f12bb3c8e9da815494a3677e82ea41/24955314555.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/939f0403575f10bce9b2701a86d99dc7/vawesanajizisotowewij.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_off000155b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B0 19744 bytes
SHA-256: b09785061ae5b2e734a30a919bd61739e72c054a9e8b1126d5da7977b1b38fb4
font_01_sfnt_off00018998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18998 10308 bytes
SHA-256: 5c8a1a525d4bb86fb489bb8f938bd379052f68602001627dc9a6adeca0b57d4b
font_02_sfnt_off0001a0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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