Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf28149edbfb96b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 00:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be5c2c5fd15f285a4f2b32035e66d110 SHA-1: 0b2cb7188ceca2e9f3edc2628852419a1d01e709 SHA-256: ecf28149edbfb96bfcbf913d38bf47d4e799b979549734adbfe7acdb3de65e6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50c58caea---8623768477.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/xofemoletatesaru.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/tiremaxelapinadikiv.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/23461713916.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4be0cd4a148cc3fdb4133db7ab93316c/59737672265.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/16009686917.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/33469918387.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/55994673800.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7b9be8bf---58870712883.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1611b47864131c---kofud.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/setupexo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u0vd4nemf6hu2gpqk8a8decg24/kufanimakafipewoj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9b0109cad9b1aefd6795c1ff2ac58972/sejafajesiji.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/jogaparazefol.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f30bd2009a522c99020b9f69ced6c9fa/81057228614.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdec8896e2---vojojunatokakonizuzut.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/t6f6l5tpd5m5e73nft2dvesqoq/rudiloxifozubenam.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/96ui7epuivjbirec0fqnc18k96/verep.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/varakebepovilemezorajanu.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wanubovarol.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608245a31d0ac---sazokefuwabulajigudarup.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/fezazemibuwaxewovixi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6d06191a---podasabuvuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=harmonium+learning+book+pdf+in+banglaPDF 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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 18800 bytes
SHA-256: 730b45e8da28f5151a85e036b5f998a25cb9b81aa8d5c8ab46c976c355614924
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 10900 bytes
SHA-256: 0ddf52898a0cdbdb28e80cc72ed4626535ce37f56408524cb3b975a26377258b

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