Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8e62020159c276…

MALICIOUS

PDF

75.7 KB Created: 2021-08-06 07:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 770a3370eecec44176567db8a3a2681e SHA-1: b7cb80ffa55cadc525d1e51faebdaffe76748a16 SHA-256: 1e8e62020159c2764f556e8e8ab05d6adcf2e47351d04aed7a4498ab9cef0a41
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=fire+alts+fortnite+account+generator PDF link annotation
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/dl9mo63obav6steriai4p460p3/wagibubanagiwodovasiri.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2c6a45e90ac0cc9db1090809ca8231fd/numasig.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vakowon.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/9917303790.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/8011777902.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d9abc4ee0b8b978de17043b6110f40e5/91488979028.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/20121209810.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/81668066260.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/95958559077.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099b93428fe4---79933237445.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/11629719718.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/gamopegivaxixizafari.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xajad.pdfIn PDF document text
    • http://berbun.com/user_img/file/12702927053.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8739061cfd4f9168027dd395bc77314c/39252739986.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/kazinerubufibavomipupa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2893f556b735c33b5117b335f60520ba/75084391112.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f4dc0f9ee7ac203d23b3c6270a6004d0/bejelamugalulekebivojuf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a2829c4d8883871a45a79dcedd5fc3e/56396117265.pdfIn PDF document text
    • http://ipublicity.cz/data/file/bawefaviwelaba.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908a01862b---20777347574.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2npi7tlkfbq2adet8knfqi6dep/xegefegari.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/14350056473.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/41365903895.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210731/16276797423234.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_off0000c4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10588 bytes
SHA-256: 9fa6d7916c98d4ab3426f1962cca85ed3c338c92e3327eb570ba0baa4a1b51b7
font_02_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16096 bytes
SHA-256: 210c42ffcd70c4732b965238632d22698284a47a98a3131324469c55b6855c3c

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