Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c183cf99c33a12…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 09:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0abe9fce2f53ff22f451d3e669d4f32c SHA-1: d97d7c7f010290249fe5518b588a659e82ecc99d SHA-256: 38c183cf99c33a12c0dc8b9b77d38b0f574ea50e36ac9ac5f5167f3dbc6f0be5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=advanced+engineering+mathematics+book+pdf PDF link annotation
    • http://fygl.net/uploads/file/141220355158.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c017172e375dfd3569a97040a46af9da/45042210252.pdfIn PDF document text
    • https://educhina.mn/editor/files/bedakeko.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/43193675927.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/74452020814.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/87317740854.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34685120573.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/65100347847.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/fepif.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/7294970045.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/58477859761.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/tizekezedajag.pdfIn PDF document text
    • http://katela.net/userData/board/file/foboku.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xisovamigofamojax.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/bugagupukop.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xatituxejijavo.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/90279345022.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a2aeceabcaede44aaca1e6e463d360ba/kubukokisulepe.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/47341775360.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396db53353d---sojuxejovi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/18a54b15a452519925033d032a6db3c7/dazeson.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xejikufus.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56312993130.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/37392161035.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/16332662259.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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 17364 bytes
SHA-256: 560003c90c245cc976a9581c5e1d042c224512f7b27b9ba968a4ee583f0f7fdf
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 11300 bytes
SHA-256: a97d3a09b67e434f4503afc41da2151324d62a2690728b415341e547fe42487c
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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