Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bae915e62565cd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 12:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89c0cc528ea47e921c96bf8371118f35 SHA-1: 00170a94ad12c41645165cfaf3a8e6a6a3371cdc SHA-256: 20bae915e62565cd177385917b2eb707b00f7cbd4297d45b5ab929fe66b4fc69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised websites and a deceptive download button, suggesting an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it may leverage embedded JavaScript or exploit vulnerabilities to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=convert+a+document+to+pdf PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u591kqcv9p409ndsqoldptiba2/93055858785.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8255c8d6---rubam.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/32315637001.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/15553793752.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/nenugafetuwumadunen.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/72944827719.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a8cc49f7ec272cd8d1c8a866f6451edf/xajazidamasawebez.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133142456215---8999190642.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/21612364917.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/89293754036.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da99054afbf1ddc5ca12cd5955dabbd8/38022901455.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/48552137229.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a059b041ae6be665c5c61e6ceef7daab/69956107289.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/pebavuwa.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/87762897190.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a2a5p8lq8fileieki0hei7u675/54016707032.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/muvogifowadeketepapive.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/vufibu.pdfIn PDF document text
    • http://pjteam.hu/uploads/65625076665.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721150ff69---97377455403.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47254328216.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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17456 bytes
SHA-256: 19adc4790b72662920b6f6a51766863284b38e087508f6557896302449e02bb7
font_02_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10672 bytes
SHA-256: 668f8788d738ba76bcdf95945fbe50e27eb2788c95bbfabde44fa4450b983fc7

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