Malicious PDF — malware analysis report

Static analysis result for SHA-256 de15001a28947fab…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 15:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aefc6b7cffd31d865a43918baea0e8dc SHA-1: 4d1c224a4ee12d8cdfdebdda81572ba5632f1ea7 SHA-256: de15001a28947faba7d42f5a804b8ea5459976a3cef8a4b99d7a11776b7c11a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=blue+iris+android+app PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/30d273f2f05cca7f6f36e7e463131732/36136033250.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gozedogojafitometuton.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061757470379.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/22101501273.pdfIn PDF document text
    • http://rld-carbon.com/file/67508357529.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vuvakokuronofa.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/33296751961.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/73575377364.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/sawuxulepatava.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/xafezisedaxejuwas.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-17/20210917211221167497.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/12164258631.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nojawojoz.pdfIn PDF document text
    • https://eklyps.net/images/file/15696857824.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345b0388be0---ketagegod.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133711bca2f0---7308466788.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454981c0dc7---rivajer.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/37865221704.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ef64060c2---judenutisu.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/ramekinupakirukugun.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/nodamorokomadov.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/49868846540.pdfIn PDF document text
    • https://jetaime-shop.com/files/83296612428.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd1355c8f---wukibileso.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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 10440 bytes
SHA-256: e2800c0b0f377815aa4bd5a73b5bb0fcefa01cee1e79a08a8db420da364a92a3
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 18056 bytes
SHA-256: addf4170bbba309f0c25ff220dcc56af33b0ef1c732e9d1340b2c4053d0690f8

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