Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e341d014cd841fc…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 00:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8821783fd67b9c6ee5d43af733e5414c SHA-1: 7c578aed16350471bd1c84d809d2e51558370f1f SHA-256: 5e341d014cd841fc13da7865b6792abb72d2a63bb658987efc5ada747471cbcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=the+physics+book+clifford+pickover+pdf+free+download PDF link annotation
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8512759910.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc0618855---88510656910.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/41971670666.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6ddc5cfdfb320b511e09ceab8cf50fd5/zujon.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kadepa.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dusisimovugojanutedu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c09730fd---80211123403.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/95724967861.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/vuxavuwofu.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/lawipuguwuzovo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9401cf3ae5---zipifek.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/silavadozefasisasa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/91868adc211b3a729e48d79c4babbcde/39128077951.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56702692f1---97148192052.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76982a9ea4---46343142916.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0228725db---28529398804.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/27026090890.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/49048979969.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jakebok.pdfIn PDF document text
    • http://drcleancenter.com/uploads//files/202108092031018573.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/44009606944.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dee346a2b---917104373.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/14929488918.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abf027e80---tigawazizutifunimemab.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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 18668 bytes
SHA-256: 49a5cbef9395342c993071e9ad968aa48aebd899b30dff794e3d4db552ae99ca
font_02_sfnt_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 11080 bytes
SHA-256: b8342d44dfcb9e72038ca300d69693567533fa5fa06963f29a951cfe364b2067

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