Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3753035702adf1a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 01:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa8f705c9820ae9f351baaaffeb65409 SHA-1: 4b13e302de1813c6ce9f9d87e1a2ef1a45375c41 SHA-256: f3753035702adf1abf6abd64f7144e8135f329ebb33d50efca7a2617484da01b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c004cdb2ae1166282d09bd8ee21fe032/71072469628.pdf
    • http://ge-mak.com/files/minizixi.pdf
    • https://perfecthospital.org/FCKeditor/file/35495640175.pdf
    • http://comlark.ru/userfiles/files/josokegetanuto.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/36eccceb876b3309758d386cc532b50f/64943237273.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/lalixora.pdf
    • http://www.fishandcosolicitors.com/uploads/files/79076089597.pdf
    • http://romento.com/uploaded_files/userfiles/files/pufafawexab.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/elt7fmlagrmr3milolhm23im60/sadetaxuwo.pdf
    • http://www.atsamuihaus.com/image/upload/File/27743608512.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/57253856374.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161393259e250c---jegozop.pdf
    • http://wingmanplanningdemo.com/userfiles/files/bipivelumidumovez.pdf
    • https://peperita.it/writable/public/userfiles/file/6327156068.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/puvuxejar.pdf
    • https://kildevangen.dk/files/wigokedex.pdf
    • https://larioenergy.net/uploads/file/82632170610.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/kagejok.pdf
    • http://isvpro.com/custom/files/selepulabavimeduretaful.pdf
    • http://reutlinger.pl/userfiles/file/vaxiwuno.pdf
    • https://taucaotoccatba.vn/images/news/files/33315059716.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/to5422k07oepg5r761il6rdokp/28947469940.pdf
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flud+ad+free
    • 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_off0000c431.bin
301dcc8051ae8ab5208e9dca385c483fe083db2ec84f9402d018096a8d52e4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 17148 bytes
font_01_sfnt_off0000f0e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
font_02_sfnt_off000108f9.bin
5b14dc0e5d021cf867a976a200112f8321f48fd19a13fcd989b936fcf8374a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 9844 bytes