Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba8bd48168aecbe…

MALICIOUS

PDF

66.0 KB Created: 2021-09-28 18:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f46e46535d02559e02110016301d041 SHA-1: 29d93f1ce8dc2070027e4a9ead3b0f58dcc6e7ca SHA-256: aba8bd48168aecbeb300d8d70f0e29574f44b4e01f2fbcb1fbbbedd9b34f4c64
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/88aff8109f737da95889e99e0f65d08c/16450096387.pdf In PDF document text
    • http://jawarakreasi.com/file/madujukapatefof.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109222155072453.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9ea917b75fc357fe4006ae8e0b5876bc/rufodurata.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/59013528338.pdfIn PDF document text
    • http://uchid.com/uploads/file/koveniw.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/59272947211.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/diwozakekejuvavujov.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/texenenedamazebibumusoka.pdfIn PDF document text
    • http://fabtur.ru/upload/files/vorizagepiwajes.pdfIn PDF document text
    • http://ativn.com/upload/file/sonegulafa.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/dipugan.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/mesavewe.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/dowit.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1rdrgbop53oq15sbolindi9sv6/38910516629.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/mabutiwubupijudomerizup.pdfIn PDF document text
    • http://em-ail.ch/pictures/2/59989598305.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tufelejigawixijusoza.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/tiwiwapipis.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092723054975.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147edd6001d7---52732865227.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/magafaposedine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=d%26d+campaign+template+pdfPDF 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_off0000ac1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1C 14644 bytes
SHA-256: f4a35bca9f6d586158aa28297ee723d2f4dd9819c1cb8222a560a25b33dddaf0
font_01_sfnt_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1