Malicious PDF — malware analysis report

Static analysis result for SHA-256 85668714eda1f6ed…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 17:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dc0f14916939d1e6161e8c7b381e883 SHA-1: 6c9a5b66b08b543952b07f990d4b799969870cea SHA-256: 85668714eda1f6ed4ec08affb6b22ad3cabdbdfa584d608dc3fc3e8cb817aaad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://rdmsrl.it/userfiles/files/rivuxiforuz.pdf In PDF document text
    • https://noddy.nu/images/file/1415011400.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zevozukeveraduwipulepix.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/89018901440.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/namixeporiwivokuredadogan.pdfIn PDF document text
    • https://signika.pl/Upload/file/jirosufuxinavanixajapojor.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/diwatisirobodixived.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zafuwaximu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/7504970265.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/29859100659.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba2df1fa4---19786415291.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7466a8725---kozudirutuvigejek.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/jatijapawuwupixemowafabu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a42aecb224---89316020311.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/dupowixotakilodularazole.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/gavibonaropesumorogurozuz.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210923_49351.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/jelarazokiwulej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f6cf4796920206e06795f3a6f5f41122/33200435825.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/32118518728.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/05/relezojowumerowaturika.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/30267510066.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/68823813407.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf9d82847---40019092319.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aek9dufr4arsocq0tn5sf81ta5/4733093123.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/rorixabanolemafepabof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=codm+garena+apk+onlyPDF 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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10612 bytes
SHA-256: c44578f7686d934f73b5490bea38bc9675148ebdef4a83d1b525ee394ac65c7b
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 18660 bytes
SHA-256: 929edd33cdf6260b33824f01f941f499fb9a36ae8cc1fe9c881644c1389cd0bb

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