Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de966cecac65027…

MALICIOUS

PDF

95.2 KB Created: 2021-07-21 00:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a120d818de5ec2e3292f1c290e5d17b4 SHA-1: 4901cdb5bf793a89a1a3219c744d64103cde5af3 SHA-256: 2de966cecac65027b1fa78a15aea2f64cd9dc9694db18e3d9ac50b3f0bf221cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content hosted on various websites, including those on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mariamozharova.ru/uploads/files/fabopijoxeti.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0d82f443---wufofinufimutawil.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/68028620962.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/wojumadop.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723511803a6---katefusire.pdf
    • http://berbun.com/user_img/file/vebavex.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b06647432de657ad437e46798bf0dba/gijeferojoj.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d8c5337e23af3dde6adf6ee60a12ad33/81852774267.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/aqd9un5f52h2kn0vli6qsetl7c/90501633194.pdf
    • http://arisutour.com/ckupload/files/tomujuxewanarem.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14717459058.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8f4c5a6c408d78c477d5b1ef162ee3fb/33052289401.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdf
    • http://bronia.org/userfiles/file/bubifutomeduvesar.pdf
    • http://bellina.pl/userfiles/file/relosos.pdf
    • http://ibtaker.ps/userfiles/file/fuponekadepewomijubal.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ciircek9bt5cv373eef5jhrsg5/17305465494.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/6963343193.pdf
    • http://aiaciran.org/cache/fck_files/file/31082583457.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/7c78d42937a8973f3ac331d7f1afee2b/kidunoxekefosudaronuzazej.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce15a45b5d---rorezaribazate.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=guilt+quotes+for+him
    • 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_off0001130d.bin
72068c26e05bce9a7327f31a89636a4857037862d3ee68a15900ade42f3edac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 17276 bytes
font_01_sfnt_off00013fb2.bin
266db421ef9d05b8171b43b94cda796997420f678019a5ebf3a3a48962f79faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 10496 bytes
font_02_sfnt_off0001579c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1579C 16792 bytes