Malicious PDF — malware analysis report

Static analysis result for SHA-256 139e9308d17489d9…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 00:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0bdf0fad6ceae835f258108090b0cdf2 SHA-1: 91009791a4beb8463ec88bb364fd1063ed745ccc SHA-256: 139e9308d17489d9d4ccca2d23a7a21e9eb581899bdec6f31c2bf889fd63c1df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware delivery attempt. It contains a link farm pointing to compromised WordPress sites, which likely serve as a distribution point for further malicious content. The presence of numerous unknown URLs suggests a broad phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73db44a23---wolutufazaki.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fc1254---35224869023.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/8327266567.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2777889a3c---mixidefubi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160828caa1f800---9534464085.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/jopisezojaxonubutewegop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/15f5d24c80904bb2cecc0d5670cb0cdf/31948357691.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/xatemesuzaramezaritulel.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c5gqp34p12rmuqt2pbim73ftk1/kiwojamit.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609208105835a---23512465404.pdfIn PDF document text
    • http://www.moyekolodin.com/files/99015030033.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/fozufutopitolisegemukajel.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/34baaeb22a91d4ae17505d137ceb7e4b/93448899886.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d55058b---17395925995.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/15247406635.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xafuwejamanulidifu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/h4qdj343nei9guthfga986p075/97310966423.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/48e127b41aeaa25e592acc6d85f95ca0/53843916100.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b5363918047---18679056326.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/79749dc384598f777e9b19f6a8976590/wesifibif.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901c0067fb5---gafivaxedofa.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/86761683252.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/35580746418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+boss+of+her+julie+cannon+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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 17600 bytes
SHA-256: 14394fc1f0e43a9042aadc994620f00db6484266569d7f3633ec6b7b3bad061d
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 10952 bytes
SHA-256: ef76bc1087ffbc496568d0f1f836dac626b48eacd0e8a5b57c111269b5f49e10

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