Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d6e6765aaf5abf…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 19:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 134b06ff9da265bcd9ab9633d376bbfe SHA-1: 7aa099db4446314cabc879371f6832a922d25fff SHA-256: 25d6e6765aaf5abf53b7214d18225f329c464475f20ec180249b734004172eb6
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=levered+and+unlevered+firm PDF link annotation
    • https://aspirans.com/files/file/vafunepolak.pdfIn PDF document text
    • http://techbis.pl/files/file/84202478825.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7edb450f45c5015328bd9770300ce910/xefamitojuv.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/afb9ecc097e66ccb22c3500d5c4613fa/58700355520.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fb3cb3uruebb3kcjfq1ju8it0k/64292227558.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a668cd979c782ead5c3c90b6e1131d6/xumafarupero.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/kifiwumaveriguwevofim.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/37775524351.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4ho95ua04vsoomqtk8fjpk9qu/kutepananopapivefuvofid.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/82548158731.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/jukitorojuwekum.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/j4ca80da064le6e7imipt8idt4/13941809736.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/082d2ba6196772c05d921dfe03471284/ronoverenisefunopugodulu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/milafizabojel.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/99621420870.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f7164501---38248705438.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54d4c6bd4---94968118396.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/60001745039.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/rukoruxuruvukovijejiw.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/82702a0d31a74cca08d4125aee883992/19186193703.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b10cbcb4a9fd26ae6f783f05b79a9d58/zoxarugatexesukatasoz.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/kewotikakaralatikinazi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83a1b7f7e---77157917847.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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10252 bytes
SHA-256: 978746816851dccad6183ba3a07e5a7f7c7f5151553f06ca0a6aa080c9dd56d1
font_01_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 17176 bytes
SHA-256: d290f7055a269b12e6917b54cf0743ae7c85f2d368777fed8600eed01aca1881

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