Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b2b455b88dd1f3…

MALICIOUS

PDF

79.5 KB Created: 2021-07-15 11:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dc92a5dc8abeea969f9b8dc759b1bfd SHA-1: 1af32c34a634d2c618dc0aade1f45b566bb857fe SHA-256: 74b2b455b88dd1f31ac902a4c39d1b11d9e51420ba7619516d62fd1479561836
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and URL analysis are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yptea.com/data/fckeditor/files/28261379379.pdf
    • https://afayl.com/userfiles/file/40277797692.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984aa6063a9---35772811412.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/zivuzedowufibemo.pdf
    • https://sardavetri.it/userfiles/file/27913211356.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607192833681a---16162590058.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d01c9f2---zemiritunonutalugibuwez.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/portdbhkn02b7dr6c02lgeo60p/50933444475.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4860a386---relisewixanikigeje.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/dijuperiwikabe.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/jujumaxo.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/13c84f9ba3bfc16154850c8731815b2f/50574156058.pdf
    • http://bannails.com/fckeditor_userfiles/file/lajilinobejaxud.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1b47da46---vapegatutefevogabe.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nk0j7filtjfcludndh53s9jm9g/34000570512.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/pofovomifutetal.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nolakude.pdf
    • http://chronocertif.com/userfiles/file/vefubiraraw.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/aodgic83fik2ocn10ot8evda2t/92842904791.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7aec88106---80157374140.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2ee292ou1087lknqgjgpar1ifd/genogenepewofixa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=drawing+of+a+cute+dog
    • 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_off0000d329.bin
990f7f80391386d2faad63808c8567fbba12a23a50c4d5bd859dda995bdbc887
pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 17628 bytes
font_01_sfnt_off00010086.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16792 bytes
font_02_sfnt_off0001189d.bin
0ce45883fd7a2c46c97cd27d1160274f549a3c07e879df16df9ea6182b6d6253
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 10624 bytes