Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c06b8d0a04b539…

MALICIOUS

PDF

92.2 KB Created: 2021-07-28 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0169126944edfca433f08796b4123ea7 SHA-1: eca0670b502c19375e5c6565e521fc16dd78c81b SHA-256: e4c06b8d0a04b539c05deffdcc9bb28b7b40dd9d2ad4894ae8eb5ebdd1c0d749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aspirans.com/files/file/40576271967.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/842d00c4bc391e89c8196889fd5274fd/70742101152.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/74635925682.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7460a298---besekufek.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ef21340d---navaresof.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/denukeko.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/57413268613.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/64012484599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e6c754bc---53946822746.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/47309563054.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/k352fn3hi44be90tphun952ce6/zigulofumagevuralevamo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tivajutibupav.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/paxobetobisusigirivabeseb.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/benosumova.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/07215cd9acf441a971b98aa09018d004/66755297690.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/da47a27a7e2f0da63e3f22eb2cc1f59b/26796192574.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/4641560890.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o7bsblckh9bmf4bt1oacp7cd0/vobiralujitogalipixisesov.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087136c2dfb1---wajulom.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b422e01f4d---20147127073.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/24055e1abf847dc08a70505d95381e75/76461982460.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09b163d45---27135837532.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/83185320721.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tl3a4b4l40nnlqev0jppluumpt/zasedakizozujapojupotat.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/87584621649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+similarity+%28or+similarities%29+between+aerobic+and+anaerobic+exercisesPDF 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_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 17300 bytes
SHA-256: 4406b60a8841110b2b9908a84eff1ab36cf26b81ba719f12db3387474bc3bb99
font_02_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 11228 bytes
SHA-256: ec99fc7531685e2506e82f4ea3b6519b1b845ec3f61589404b9f32b077291e8a

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