Malicious PDF — malware analysis report

Static analysis result for SHA-256 46db06fb8b6eded3…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 07:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b57232926a736db76c401b020ad908ae SHA-1: a4bb8618cb366c0f5fba82e54bb85169ba246fd6 SHA-256: 46db06fb8b6eded3a224a0201812d55f29df3af4299bf74b379f89a353191d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple PDF files hosted on compromised CMS upload directories, a common technique for distributing phishing lures or malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3919697e7e605a720123a3790466b2ac/60584780494.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/49980453381.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/38930162443.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/gepuj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071caacba35e---tipil.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c7493b12a893b8f13291ddb72c4ebc02/wativipilajagovefax.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/2469817392.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/84576690307.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8o5f0bcbq8n4ko0mqqiq6td9us/lowejidesewixilise.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/jobife.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bcb57f95---9169606352.pdfIn PDF document text
    • https://bloomeng.com/uploads/15990554957.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/92869337013.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051311351036.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v3c55hvint7ukshqlge9oavah1/dofugadaxeroruwuled.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607569d7e5f21---rafobevozesavivurifegimo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c43d71105740de7d58f951f3c8ed4e79/61632090402.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4fc0e235---78760544438.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kejiwugolekowabekujubiwat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072447f06c70---rexexedigebupajobobepevog.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd08789b8---tuvoloseponikisudaje.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wikirerepivubugiza.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2ac6c3bc---72366575643.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa51e3f8d---93647048267.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abadcb94d3---34105975191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=most+commonly+used+sig+codesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10660 bytes
SHA-256: 9866268d36e8146bf4576f0faaff26c46d6c6415d7879624843d3300bb7646e7
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 17664 bytes
SHA-256: 4162e3535e83d4f531c682a1d3cf49a3c04d2c0e5af4d56447dc93a3efcb1c44
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16160 bytes
SHA-256: 61893c6f5a4ed8be90b59e62ba5f7845fe3f782be61d2927f64273611613f2a4
font_03_sfnt_off000141f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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