Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ee9fe3c4e7013e…

MALICIOUS

PDF

116.0 KB Created: 2021-07-03 17:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 988bd29479b7e428de06834be418b522 SHA-1: 45de09ecd874e5ef89f97dbf101709f5883a9e7b SHA-256: 83ee9fe3c4e7013e193747bdbf2a3a493207a351801d38a74fb23f7bc8a763e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://queure.ru/uplcv?utm_term=icd+10+low+grade+b+cell+lymphoma PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/239a998f22fe0e78b230a86886b623da/30056473087.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rejasat.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vufobuwoxozokekas.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/771212628add82685d65fe4bd1224044/fezutitipoziwov.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likivuraf.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/614300f1fefcccba26ebf81aa3fb6323/47452463869.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a20aa27008c---70364536906.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/37282596937.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nezemusetosutewuvod.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/87859577922.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30086559f---zoseje.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/sipexidopenokutedu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/73210907595.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11378dad5---6458739212.pdfIn PDF document text
    • https://kildevangen.dk/files/45082602841.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742224ffb9---bitolisusozef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/528235bbb5ad4da09231b4076f4f257f/24018915872.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73aad4248---derefilamoguxilijimilod.pdfIn PDF document text
    • http://nensi.si/upload/file/95704075296.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c6bd072e---talor.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/lezukuxoguwuvenekev.pdfIn PDF document text
    • http://tano-cable.com/d/files/37513980575.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc85bb995---gomifitazisojefidazilup.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_off00016013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16013 19136 bytes
SHA-256: c4d7495e00506aa9f50913b322dfef510a51e75b70fd98c15fc3252e6995e024
font_01_sfnt_off00019195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19195 10964 bytes
SHA-256: 566ab8123f61e83917f5743830f1c09b31c3c1f73a2d0f2c295d90af8ca76026
font_02_sfnt_off0001aab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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