Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bf39e961b64002…

MALICIOUS

PDF

93.1 KB Created: 2021-07-08 07:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 618acb1b9db239d828ee3942ac0c17ea SHA-1: 4ceca140127739518d8f021705d9d199dbc15e0c SHA-256: a5bf39e961b640023f846bfc760d70f05b3b0a911d0e92f39c20f0124d0377a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cottonweb.net/userfiles/file/63044121650.pdf In PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/rorajulidojoxogazijite.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mebaz.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/44202322069.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/71af62dbf3f61b3285a26a405c0a04ca/dotarekazape.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8um06mtn2bckebk8okjicpl6cn/85028966576.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8d5fe0d70---gevugezabe.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/luxiwaxenumifora.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/35262218085.pdfIn PDF document text
    • https://rosycaffe.com/file/fojagilolasavirepomon.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/d9qprpsm4bef14i0cm59coshr4/29700701095.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/nanejawubodemosilivedo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7127613d819ed5a132522b6ff6af8a0/88639514828.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160736de96a154---33724988014.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf450511e4---newiferajoxijawa.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/91854462823.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tazigafib.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de8b0d19186660d19235f75ac3714a95/38064896034.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6ae11142bef42500cb2801f5c1d32cce/fepepitajeke.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e455af24abf30e2f7f8a299b8200ff24/dosix.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160967829b55c8---1573034012.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22a3c6f3a---55923971518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=harry+styles+and+taylor+swiftPDF 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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 18108 bytes
SHA-256: 14ee6b91da456554575c04f7fa548eeaf058b7248d0324ce26bb1b9d1d2ddeab
font_01_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10540 bytes
SHA-256: 1ee89ca8e597486440f63d5814e0da2a7d7df2163ba0de5403c7dd7a51f6351e
font_02_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 16416 bytes
SHA-256: a8d1e34bf444334761db8dd673e30599a677bf9ec537d4b136fd145dfe542046
font_03_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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