Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9354cd81db48529…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 701ead40c6e34c72d22ef9a8ff47c93e SHA-1: ccca080809f43e3aa1c443d5cf213fb463a75284 SHA-256: b9354cd81db485290abc3c7546aa780f38934545fb42ba8c48750c0b999540cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=burma+tv+7.0+apk PDF link annotation
    • http://skonasystems.com/userfiles/file/renisedewil.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/wirezozam.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6q5vcmplv3b3b4duiq8r0r9jf1/wakogiziwi.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lojilirobovilomugodumubuz.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jenobedira.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/mutofotumivalosalokaku.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/48676468957.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/91769730802.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134729d6fb5e---gotiwe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d557e1547172ca15c4b1fc1d7818ebbe/dugezizozejero.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/31742826972.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/fosabilegujerobixulut.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/pefefazotamumikawujek.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/rowotikolafiri.pdfIn PDF document text
    • http://otczenacts.com/media/files/malegavomufabixinoputa.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/fufeteguz.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/32039088982.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146f83229ae6---18491867655.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/lorowozewuxarakubevuvu.pdfIn PDF document text
    • https://pokereshop.cz/data/file/99864032275.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mokezijodorus.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/47428264637.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/40674080096.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/kofasujozidoriz.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/32891187191.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 10300 bytes
SHA-256: 81d6d911531e0dc66cc2a4c965e11d0e0d44edafd3553363a6d224d5032b3913
font_02_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 16912 bytes
SHA-256: 2308db276268a1e52ab061715f78ec77dec6085cc93dd0c628eba4b97011bc4d

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