Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3a3a3583f443f7…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 23:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d67d1009fb221916bd57486c596bf0d SHA-1: 426c6111821ea584d5eadd391a1f52a548fe198a SHA-256: 2d3a3a3583f443f72e97eb2f513bc6b9f64161e67a8ff70372a46520cf28f782
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised WordPress installations. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=cat+past+year+question+papers
    • http://bakoca.hu/files/file/rukibufujafosuxofag.pdf
    • https://fajanav.com/aym_image/files/35887756049.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/730iitovn6anvnban1co4ehmhd/bezogegimagafag.pdf
    • http://accronline.com/userfiles/file/55818343917.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rd6ou0vqb2t4e0kbn8bbcpaam8/nofek.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/421da804796f8049078a291a6aa464dd/36561935580.pdf
    • http://18554080.com/userfiles/file/88324910831.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d548b57af6---sonab.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609829bb8bba4---tujexusiwerudazegedanob.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/17738697477.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/27cced889d4e3767f6763874f976f3a5/14171315134.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4819a6fc---vomopurixen.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c20fdce85039b2c197002830fdecb100/50843912584.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928d2ec3dd2---18135019472.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891e4e3ce50---2674814009.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ba1b56e432a4693006ed615f2c8dd9c4/legelobebexip.pdf
    • http://kasargod.net/uploads/file/kurodabapeliziw.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/po4nd7giqddj6u25bcj1mjnoqc/62030002397.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e5edbd7b---dukawuba.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i5718g88llh7lj6c7egqq3ke71/xutameba.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/nd8l2e25lqdg2vivj7k8ldj7h1/rufive.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9e5ffb535afb7ff4f16352603ed0f1dc/76489990816.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/zuzinefuzagezawafasewijo.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qasbdefs2ab02um0den4bdq2o1/47379456935.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e848.bin
2035ce4aa42e146e865b2b7b5376bc0e64b654b74b0766f07ce9334986d56455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10588 bytes
font_01_sfnt_off000100a4.bin
12d817fb3535474a38a09bf8357cdd3b065bd69f09e91d95b79329b873dc99a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 17016 bytes
font_02_sfnt_off00012d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes

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