Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cfa0087dbfab47…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f09e5fbd435526c932cbc23cefb9492 SHA-1: 68649ed70f1279a5feaa4bcc5d431275f3141b47 SHA-256: 56cfa0087dbfab478d45f5932b67a310cd4432b9bb5cd9417540757061e7adda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=hematoma+retrocorial+en+el+embarazo+pdf PDF link annotation
    • http://tbvshungviet.com/upload/files/29292378864.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/62239610109.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec563bc247a8fd1a67ea5fd1c4c9ad46/37012885605.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c465ac4cc43fbd43aef0d7c8f67c99f1/bewop.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/sobutuzat.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wixegokoz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5e7864fffd8016e7153dacb4d306c802/67477516636.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kasenikepebizokegeganixam.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/97623583043.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d0bcf7c0---93020817663.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pufurezif.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/xakajiluvisowejamegumitu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/721920929.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/701132149bec86a487f6111e8fbfaebc/3483382113.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/415sl11uhnisel6klt82fo6kj5/63654984264.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/114155308860e7375910dd3.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/51553040141.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/vuzumuremubeso.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qc66aht6i8mmh0gn8smsaqde54/70595011315.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210707021634.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekupadonowipiga.pdfIn PDF document text
    • http://imi.vc/upload/files/73058170052.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/0a8039ab692611a18356ed7be19213cc/titizolebosozasatokenu.pdfIn PDF document text
    • https://hiroyoung.com/data/files/rusedon.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/68u2ed3065vm9lkuduhihhe04g/nipudunabonekozuboperiza.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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 14872 bytes
SHA-256: 712307ff1ad06ea9c8dad0774b76999f9a04639ab7cd5dea1296165e7d5fd310
font_01_sfnt_off0000db1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 10804 bytes
SHA-256: 6c4879e96c26ed12823ae92c6e73fd14bc98e313403f213d8b242c4380594ca4
font_02_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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