Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fb61fa917a404e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 263b4ebf24b6b65ce062c1554e5460c1 SHA-1: 50825bdbcf1a8d05408792a5745f34e687012e20 SHA-256: 72fb61fa917a404e0116262d489c5c218078c58c7f8a0835a7715005ac86342c
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=arduino+uno+documentation+pdf PDF link annotation
    • https://prtl.pl/userfiles/file/kidaputi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073640111534---mekitebipanubujofanepe.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qm6nsja39mejebpglacn52hpfb/kilezezososemiluzuvubugo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffb99d7a85---sowovadosaroteliweku.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47351b7f60---97186691129.pdfIn PDF document text
    • http://come2menorca.com/images/file/92414191765.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/xawimawemigizanerodobivis.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce082ac034d---77585841656.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8892dbe2c388c9512d01658995339699/zigatasemedadavinun.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32d1680f307d5b0d52862b9940d3a64a/96657981439.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/lopod.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60dbe97b0---pavilub.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vefefogimu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/60832942595.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160822431d8776---54528361605.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/josaxojofulozove.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/mezugitud.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/31470624821.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sutamosokemi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/39518704503.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35878e92e---82438208689.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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 17580 bytes
SHA-256: 62214c0a2ebb3a95514bdd7be07a055a5518f31ec404d33a7fef7f3d70915572
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10648 bytes
SHA-256: 202afcf48d69eddc920fd5169a380f4c3c50b1aa188ff9779912d2491a984a1f

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