Malicious PDF — malware analysis report

Static analysis result for SHA-256 2201139614f6af07…

MALICIOUS

PDF

104.9 KB Created: 2021-07-07 00:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: da4795e4fa019befd291ee0b2f8aea64 SHA-1: 6e69b2658c780704e632241ecaa5c4d4d06737ba SHA-256: 2201139614f6af07ce59111a0ba2cadd970e6c9e13ea0da8e7a5994dd1a9f84f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious payloads or phishing pages, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0cb7cf7a219d1f4790a4529f13143f04/36814144623.pdf In PDF document text
    • http://abnicum.ru/files/file/87306658876.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/limololure.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3642311597efd8ccde61fcf5f8650769/51264237266.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/xusida.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/80366347472.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/73f37fb0a65fdeda202bd12c7be40326/17088025252.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/ronepupunasosuriwizog.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/97530051726.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-15/20210615213220725563.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/2903832511.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607697998614c---49752255456.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/79398206684.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ce431036---62240343580.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a627914331c838d2225dbfa8c974adc5/jerubuginazodapun.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/col85ng6kk28m3osrhemqn8o8r/nerizivixikekupuratakedun.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3c097a3d2f30e57f8c25a51647d9e174/71103042534.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xofetaselerukenutabamevu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/buzavijilaxep.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/80415579319.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b8103669---8635729735.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/23295174999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=parallel+processing+applications+pdfPDF 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_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001508d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508D 10796 bytes
SHA-256: b967437968ea3b799d3ab54e7ace274d0638cc544e4c111babc808c79c4de7b6
font_02_sfnt_off0001694b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694B 17180 bytes
SHA-256: 7a275b64397b5edcfd2135dd94668ae7ef3bec6f1898eefdb0be30b1f1b905fa

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