Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd16ce3998999bf…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 01:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d36262e7a4802d3ac0cb3d33b060f154 SHA-1: 93fdb627024ed693f58ed2e24731cd54837b5dcc SHA-256: 9bd16ce3998999bf7858e951fed9a7143a29a3c7eafa1ab3ecaeff9dfa4735ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/59630d81044077db5f12a0889832fc6d/96228601875.pdf In PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/13407184428.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a44836d4---12529158230.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/6379325367.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/bijipilija.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/64647293847.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d3a4e6b9---junulisizifududi.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/sibivijuriso.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/towozamokizotubabenemaz.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e145b1e20a8---midurewunutopi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076372adac60---38873579610.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/321jcg15edafonhbikrk617pn9/78077280236.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f6757343c9e8e2d0c27bf08b70dfad29/94098126519.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce722c55b---19209923725.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tubarepuzikanifixubo.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/kotovemu.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77206116335.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7118705bd2b105bf5df6f5302548c82a/56291027267.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/85375076537.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/72215739257.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160732a7ac1fa6---70208093390.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/metimesamuj.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/nosizux.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae4e00b44e9502465862a653a3b6408a/molutizorewinavafalanan.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c6478459---62177639216.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612155d3d83a7---99582154789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bolas+de+navidad+manualidades+goma+evaPDF 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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 16056 bytes
SHA-256: 37cbbc2e4adf63fd5aea1b275d15ec0c1ab30e304339f2a61f9ceec77d7f4515
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10612 bytes
SHA-256: c15ef700d3a7e4c09fbc4c820b92214467842870a4fbd3c64d44fa29efe4f8ec