Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbea1cda15372bc3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 16:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38ce5c5b6d3dd5cdc260bb984e6ffbd SHA-1: 6ca20eec9dbc735d65878c291d763f687a036499 SHA-256: cbea1cda15372bc3ea6d8a6387625ea1c99c8228fc8dac51f0a4d8c9be81df41
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hbeqcocii2i34cvdapqm2jprg5/wetafo.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f69ea30cf9d4f61411a3a2bbc8a2e816/gigux.pdf
    • https://mfdesign.hu/files/file/9360675288.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32401941585.pdf
    • http://cupta.org/userfiles/files/20210630102633.pdf
    • http://www.awakohchang.com/image/upload/File/ijasijazaweka.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/78075090571.pdf
    • http://tunglamgarden.com/images/fck/file/60280430664.pdf
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/nutofakasiwuvedajeredij.pdf
    • https://uppersanduskyrotary.com/cms/files/File/xixawexefi.pdf
    • http://rc-mst.com/mst/_upload/files/tobapegirivi.pdf
    • https://novahealthclinic.ca/userfiles/file/zubazid.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3c3bfcfb9f4e9d87b730f179058150f8/vubakefawa.pdf
    • http://adabaskimerkezi.com/upload/file/wotimivoluxetamadif.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/82163111117.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/12659174120.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e08f97460---dojifijupojuxavokaregar.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa862b5658---96350650662.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdbabb8119---totewosa.pdf
    • http://bannails.com/fckeditor_userfiles/file/30915503651.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ee5476c5---85871822158.pdf
    • http://kraski-chernila.ru/resources/file/20896005938.pdf
    • https://silga.ca/userfiles/file/bikazokulemekuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cover+fire+game+hack
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f730148800fd17b6d84573add3282df3/3650954911.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e812.bin
dc3c216b72ea4bccb98c7868ef5b759ac0078c533375ba86ffbbb8410144e080
pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 17812 bytes
font_01_sfnt_off0001167e.bin
3312a3a3a886abd2ef2fb41a9642049f2dd3fd51bc7e957e4467e4d9f5dfafa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10556 bytes
font_02_sfnt_off00012ea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA1 16792 bytes