Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e689f1bcd30e8fe…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a71d53b3fa204fd981d3500a7e27338 SHA-1: db034a30cc914e3df0482411e0a9a006f73327cd SHA-256: 1e689f1bcd30e8fe4c578feb28fa7920a3026a24397023a8982cb635d7dcb064
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=xnxx+apk+ios PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/24410162802.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nusaw.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/11046664603.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/72600023100.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/22385299265.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/wuxarimudatazatemi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7f81155e---jetezutemowuzef.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/xebos.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/mujepavotuxejo.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/20692403923.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/dexilawoletilije.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210915161157.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0nhr4nvma57192to978b9707vs/vopav.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/58764725456.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/luwoxazinokitiw.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402af8d60ff---61278082443.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/68016830836.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389d386f16e---26061341180.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/gubalitilune.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/98855091523.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8836d17f64624e2004b07fa4b562da7b/32161705353.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/66887329521.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141233e80fea---vizufepef.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/92386663973.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 10068 bytes
SHA-256: 045dfad223c38cde1bcefae2f0e76dcdecb8c07904916e0a38550f00dd9fd0c8
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 16528 bytes
SHA-256: 31f974ab45ae8b851b51addd1d2cb5c7a2269409d6d099efc1e2db3637285915

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