Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b368223a35c95…

MALICIOUS

PDF

91.8 KB Created: 2021-09-05 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a76c961e17eba6bc8784465e5f9c602 SHA-1: 983d402fe97945255b8bbb43a8ab725e255bec98 SHA-256: e83b368223a35c95f8b02e3dabc69d577138edc2b3224ec0493e424df7d4f9cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of using compromised websites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.bash.cl/media/file/dudorunojigelu.pdf In PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/dosuzowixovoxaso.pdfIn PDF document text
    • http://fdceta02.fr/catalogue_dynamique/file/tilebegejodeludemenusax.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/26658840786.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/9vn8raq5eh7vmmofahl2plsvb7/44546892904.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/p5e5vsnvjd5g21f4rqhgcrqivu/84471063008.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/manopirime.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f83c30ae---18792649061.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/df4686e9bb7c59f741f8d65453ac3918/japipebebogirab.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fubaxix.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/47358823107.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mulodexorijema.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0729139e46c786ca5f23679a65e3d6cb/47103757529.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcda9b49fda---88861205490.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/q4i9tfdckr5bof4v99aggb0fbg/nowototowokutedaj.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210728_100457.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nonogemiribugero.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/78758310783.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/169666662.pdfIn PDF document text
    • http://nature-revive.org/files/file/12633423269.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34293166225.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6fdb8126df89e480425a3e9f1f437cc2/selezewaxuvusofiru.pdfIn PDF document text
    • https://irantruck.ir/data/file/widonarenegebogarow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=spanish+vocabulary+worksheets+pdfPDF 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_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 11388 bytes
SHA-256: 1a5250341c1ad2969da2e3f8b1b2b3fbe594e20cf4c8a1299b17d8842278972b
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 19884 bytes
SHA-256: c451c255f39f224c74144ac32da6a77b1ab6b252ff319dff96524806249bb6f4
font_02_sfnt_off000149b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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