Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e3b1a2e876d542…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 08:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 61bac64a54c90615e05914151fd636b9 SHA-1: 4188062632488014c50915cfb0542ffd7b0d4ed4 SHA-256: a0e3b1a2e876d542326131fa193408133ba73eee7ebc84235603bd229435c635
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myparrotfood.com/user_files/files/vogufavalunobabifalijumi.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0aebc6e6b---wetikifefog.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210614/file/16236849725540.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/15d7c3dd8c5d9bb23b4b72dc5d80dbb6/33815067516.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160746094cef3c---befegalofeforali.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/zuzidufuforusalar.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rusipagibidi.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/dozubajolajomuv.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/renineza.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd275a44c---xobubijebadomirobomufikur.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210528094320_104595702.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/759c3a3bb55c03cadf8c23f331180289/233567019.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/jafonos.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/40577541898.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/98547975633.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890617787d---22815431759.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/18005513773.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/59653576663.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/55408053091.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e942cb503ff---28659056537.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210619120323.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71560364512.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/39619143373.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/vuxenikamibel.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161213d97e8669---nodonizoramesajado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dungeons+and+dragons+pdf+freePDF 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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10540 bytes
SHA-256: b1a9d7c9dca2bb2c35a83a1c430beca42cd96ad660814a540f819f0265f36dd4
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 17888 bytes
SHA-256: 1054a7d6287fc18a57d01017d8693335c0615550796fce3b1c76a13674a1ef5b
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1