Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249110f4e48e66c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 22:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cda78254c32fd8f919b94743cc6490dc SHA-1: 315b74465e2355132811267918dd85a80a705cfa SHA-256: e249110f4e48e66c8a33a6b760f21cabd3acd392a84276a1b70fb89ed6cf8ba9
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 platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external sites via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lnianemarzenie.pl/userfiles/file/zonibab.pdf In PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/bozodof.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/25530074842.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/6461d012e7fa99c995c1e0fc3df2f25d.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/83d94aa21b3fbf5965b94e67da4ba88e/sasoxadonebi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/gofawusopus.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tk3d9cc0lg0ah1kkqee1cc39h2/fuvaraw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4e9bfcd3---tijimo.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/59383238998.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xalodirakubakebe.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/486cc4de3a392bcf59a1cf7f6bca30de/81018109752.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/koruxuramawatuximataku.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da126bfae8---mijizoxupebirunuramaku.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/mutowukalotopaxuxulaz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d00312dd0---81729265075.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287346dfa4---15338788457.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bujolu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vivevenusodapemotelovewet.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6ff15053---fubazaret.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160765547c5d2e---22863640828.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/xovekokupuze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a7768497---46987615193.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mosevixelukanijepoxu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071634c36899---golimufu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/o1neirna43cp7injgju5rdmni7/16433522069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=most+carbohydrate+dense+foodsPDF 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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10684 bytes
SHA-256: 385f664ebfed2616ecf7112ff7faaf46d59fb06a4503e1bde3e98bf9d225dffd
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 17784 bytes
SHA-256: 3878d297b538b105c4f165262d94b35d6c46aaabd91e80362f7f261aeb9a1eec
font_02_sfnt_off00013e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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